Answer:
The correct answers are options b and d.
Explanation:
Obesity refers to a complex ailment that comprises an excessive concentration of body fat. It refers to a medical condition, which enhances the threat of other diseases and health issues like diabetes, heart disease, a certain type of cancers, and high blood pressure.
There are many causes why some individuals exhibit difficulty in preventing obesity. Generally, obesity results from a combination of social, environmental and inherited factors, apart from this it also depends upon one's personal diet and exercise choices.
Some of the risk factors for the development of the condition are family inheritance and influences, an unhealthy diet, and inactivity.
Some of the societal influences that can contribute to the condition is getting influenced by the food commercials displayed in between the television shows, adoption of unhealthy habits, and easier accessibility of movie, television, and computer games that enhances the sedentary lifestyle of an individual.
However, of the mentioned options, the self-esteem of an individual, and the resting metabolic rate of the individual do not contribute to obesity. Thus, the mentioned options are not examples of societal elements contributing to obesity.
chemical eric 8. It also turns out that he has unpredictable shock responses, so that a small cut needing three stitches left him pale and in shock while breaking his left wrist in at least 15 places did not. What hormone could be involved?
Answer:
The correct answer is- cortisol, and prostaglandins.
Explanation:
The shock response take place when the body overwhelmed with the responses due to infection or injury. The shock response is regulated by the hormones that play major role in the body to fight against these injuries and infections.
Cortisol is primary hormone related to the stress conditions that lead to increase glucose level in body and blood to repair tissue however in some condition due to cortisol production issues did not play its role as mention in the question. ACTH impacts the adrenal gland and the production of this hormone can be compromised.
High levels of prostaglandins also play a role in the healing of the injury that takes place by causing inflammation redness and pain at the site of injury.
Thus, the correct answer is - cortisol and prostaglandins.
Adrenaline (Epinephrine) is the hormone involved in Eric's unpredictable shock response. It is released during moments of stress, instigating the 'fight or flight' response. Inconsistent reactions could result from varying adrenaline release and body reactions.
Explanation:The hormone involved in Eric's unpredictable shock response could be Adrenaline, also called Epinephrine. Adrenaline is a hormone released by the adrenal glands that acts primarily in the body's response to stress, enhancing alertness, and preparing for physical expenditure, such as the 'fight or flight' reaction.
Shock response in such a scenario could be attributed to the sudden rush or lack of adrenaline. This hormone is capable of resulting in varying reactions depending on how the body releases and reacts to it, as exemplified by Eric's contrasting responses to different injuries.
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In humans, male-pattern baldness may be assumed to be controlled by an autosomal gene that occurs in two allelic forms. Allele B determines nonbaldness, and allele b determines pattern baldness. In males, because of the presence of testosterone, allele b is dominant over B. If a man and woman both with genotype Bb have a son, what is the chance that he will eventually be bald?
Answer:
75% of chance that their son would be bold
Explanation:
Doing a Punnet square, you can determine the chances that have the F1 whit certain characteristics.
In a Punnet square, the capital letter represents a dominant characteristic, and the lower case letter represents a recessive characteristic. But in this case, because of the presence of testosterone, allele b is dominant over B. Dominant mens that if is a pair of heterozygous chromosom, the dominant will appear in the phenotype, means physically. The recessive characteristic will prevail but only in the genotype
The chance that a son with parents both having genotype Bb will eventually be bald is 50 percent, due to the dominant nature of allele b in the presence of testosterone.
Explanation:In humans, male-pattern baldness is a trait that can be controlled by a single gene with two alleles. The allele for baldness (b) is dominant in males due to the presence of testosterone, while the allele for non-baldness (B) is recessive. When a man with genotype Bb and a woman with genotype Bb have a son, the son has a 50 percent chance of being bald (genotype Bb or bb).
Considering that the parents are both heterozygous (Bb), they can produce offspring with the genotypes BB, Bb, bB, or bb. Since allele b is dominant in males, both Bb and bb genotypes will result in the baldness phenotype. Therefore, there's a 75 percent chance for the parents to have a child with at least one b allele (baldness), but since we are specifically discussing a son, the relevant genotypes are only Bb or bb, giving a 50 percent chance for male-pattern baldness.
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Ribozymes
a. are enzymes that degrade RNA and therefore have potential for clinical applications.
b. are self-catalytic RNA AND suggest that nucleic acids evolved before proteins.
c. are self-catalytic RNA. are complexes of ribosomes and RNA.
d. suggest that nucleic acids evolved before proteins.
Which of the following is not a capillary transport mechanism that allows for the exchange of nutrients and gases? bulk flow diffusion through the endothelial cell membrane transport in pinocytotic vesicles. movement through intracellular clefts or fenestrations
Answer:
The correct answer is "bulk flow".
Explanation:
Bulk flow, also known as “mass transfer” or "mass flow" is a mechanism of transport that works by the creation of a pressure or temperature gradient. The pressure gradient allows for the movement and exchange of nutrients, water, solutes and even cells. Bulk flow does not use a capillary transport mechanism like other separation approaches.
Bulk flow, diffusion through endothelial cell membranes, and transport in pinocytotic vesicles are capillary transport mechanisms. Movement through intracellular clefts or fenestrations is not, as this involves intercellular or fenestrated passages, not intracellular routes.
Explanation:Capillary transport mechanisms facilitate the exchange of nutrients and gases, but not all options listed are correct. Bulk flow refers to the mass movement of fluid due to pressure differences and is a capillary transport mechanism. Diffusion through the endothelial cell membrane allows small molecules like gases and lipids to pass directly through, while transport in pinocytotic vesicles involves the movement of large proteins into and out of endothelial cells via endocytosis and exocytosis. However, movement through intracellular clefts or fenestrations, while it does exist, is not a capillary transport mechanism, because materials do not pass through the interior (intracellular space) of the endothelial cells but rather between them (intercellular space) or through fenestrations.
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In order for life to survive, bodies or cells must adjust to environmental conditions. This is called _____.
Answer: Adaption (I think)
Explanation: Certain living organisms and animals can adapt to harsh environmental conditions, and if I'm not wrong, cells can adapt, as well.
Answer:
homeostatic regulation.
Explanation:
If an enzyme's active site contains only two ionizable residues, an arginine and a glutamate (pKa's of 2.9 and 9.1, respectively) that participate in the catalytic mechanism, what would you expect for the optimum pH of the enzyme?
Answer:
Optimum pH= 6
Optimum pH for the given enzyme would be the average of pKa values of two amino acids (2.9 + 9.1 /2= 6)
Explanation:
The pKa represents the association constant of amino acids. It is calculated by taking the negative log value of the ratio of a dissociated acid and the conjugated base which in turn regulates the isoelectric point (pI) of the protein.
The amino acids present in the active site of the enzyme regulate the interaction of enzyme and substrate. The given enzyme contains two ionizable amino acids with pKa values of 2.9 and 9.1 respectively. Therefore, the optimum pH of the given enzyme would be 2.9 + 9.1 / 2 = 12/2 = 6.
At pH 6, both the ionizable amino acids would serve as a good buffer with their active proton donor and proton acceptor species.
Virgin queens will only exit the hive for her mating flight(s) if the following condition is met: _________
Answer:
The correct answer is "the temperature is above 23 °C but not exceeding 40 °C".
Explanation:
The main function of virgin queens in a bee's hive is reproduction. Normally virgin queens do not exit the hive except to perform mating flight(s), which normally are done with 10–20 drone bees and then return to the hive as mated queen bees. Usually virgin queens perform her mating flight(s) in ideal temperature conditions, which are with a temperature above 23 °C but not exceeding 40 °C.
Answer: The temperature is above 23 degrees C (73 degrees F)
Explanation: Under normal circumstances, there will only be one queen in a hive and she will normally remain in the hive. She will only leave to do her mating dance with the drone bees. The only purpose of the drone bees is to mate with the queen. She will usually fly at about ten metres above the ground towards an area where drones from the surrounding area congregate. The drones will start to pursue the queen at which point she will fly at an increasing altitude with the drones chasing her. Eventually she will be mated on the wing by several drones. After this she will return to the hive and will start laying eggs a couple of days later.
A group of nursing students are reviewing information about nonopioid analgesics. The students demonstrate understanding of the information when they identify which drug as a nonsalicylate analgesic?
Answer: Acetaminophen, Diflunisal
Explanation:
The non-opioid analgesics and non-salicylate are the anti-inflammatory drugs. These are non-steroidal in nature. They can distrupt the production of the prostaglandin which is an mediator of inflammation and pain.
Acetaminophen: It is a non-opioid analgesic which can be used to treat minor aches, pains, and also reduces fever.
Diflunisal: It is a non-opioid analgesic which can be used to treat pain and arthritis.
Solomon is studying for class. To remember the term _____, he uses the analogy of a thermostat in a house. For instance, when the temperature falls below the set point, the heat will turn on to correct the temperature.
Answer:
Homeostasis
Explanation:
Homeostasis refers to maintaining the constant internal body conditions and mostly use the feedback loops to counteract any deviations from the narrow physiological range of several variants such as body temperature, blood glucose levels, etc.
For example, the human body maintains the internal body temperature around 37 degrees Celsius irrespective of the temperature of the surroundings.
When the body temperature rises above the standard range, the secretion of sweat and its evaporation to create the cooling effect is one of the several mechanisms that serve to lower down the body temperature.
Likewise, when the body temperature falls below the normal physiological range, increased heat production and prevention of heat loss are triggered by hypothalamus via autonomic nerve system to increase the body temperature again.
Given that CO₂ is produced by cellular respiration, why does the amount of CO₂ in the atmosphere remain relatively constant? (When answering this question, exclude the impact of human activities on atmospheric CO₂.)A) CO₂ is converted in photosynthesis to carbohydrates.B) CO₂ is split apart during photosynthesis.C) CO₂ mostly forms carbonate rocks.D) CO₂ is trapped in dead organisms' bodies.E) CO₂ is a buffer.
Answer:
A) CO₂ is converted in photosynthesis to carbohydrates.
Explanation:
Photosynthesis is the process wherein the phototrophs such as green plants fix the atmospheric carbon dioxide into organic nutrients (glucose). The oxygen gas is released as a by-product of the process.
During photosynthesis, the splitting of water is driven by solar energy and electron transport during light reactions produces ATP and NADPH. The ATP and NADPH drive the light-independent reactions of photosynthesis wherein the carbon dioxide gas is fixed into glucose.
For the purpose, the green plants absorb the carbon dioxide present in the air through stomata. The absorption of CO2 for photosynthesis keeps the atmospheric levels of the gas relatively constant.
Write a paragraph of at least three sentences about stem cells. The paragraph should include what stem cells are, the controversy around them, and your opinion about using them for research.
Answer:
Stem cells are cells of a multi-cellular giving rise to an unending gift of more cells of the same type. The stem cell controversy is looking at how the stem cells develop, how they are used and how they destroy human embryos. I think its a good thing the do it because it may be a big thing in the near future that they can use it for some cure or something.
Explanation:
Stem cells are a type of cell that have the extraordinary ability to transform into any specialized cell in an organism. These cells are able to differentiate, through cell divisions even if stored for long periods of time. In summary, a stem cell is able to pass through several cell divisions creating a large number of cells, capable of forming tissues, restoring organs, among many other benefits.
The great controversy surrounding these cells is that they need to be extracted from embryos. As you know, the embryo is the initial stage of a living organism and for that reason, many people believe that it is unethical to remove cells from an embryo when it does not have the capacity to allow or deny it. Other people claim that the regenerative power of stem cells should not be manipulated by humans, as it takes away the sovereignty of God in relation to life and the human body. There are also people who believe that the regeneration capacity of these cells is somewhat controversial and that the negative points of using them have not been fully explained.
However, we must see scientific research that uses stem cells as a major scientific advance, which will help countless people around the planet, such as people with osteoporosis, bone problems, cancers, among others. Such research should be encouraged, so that the problems surrounding stem cells are resolved and this technology can be used.
iv u answer this ? youll get points
the answer is A. covalent bonds
A persons skin cells and eye make different types of proteins to perform their functions. What's is the source of the instructions from which all of the proteins are made
Answer: From DNA
Explanation: DNA is the inheritance molecule in humans and carries the information for every protein needed for our metabolism. DNA is transcripted to produce RNA and this is translated to produce proteins. Each type of cells has the same DNA (With some variations due to mutations in life) but their DNA express differently according to their specialized function.
How do the basic principles of inheritance, identified by Mendel in plants, differ from those in humans?
a. They are simpler.
b. There are no Mendelian traits in humans.
c. Plants don’t have alleles.
d. The number of chromosomes is different; therefore, genetic principles vary.
e. There are no differences since the basic principles are the same.
Answer:
e. There are no differences since the basic principles are the same.
Explanation:
The basic principles of inheritance as proposed by Mendel while working on garden pea are applied to all living beings including humans. The human also has discrete units that regulate genetic traits. These units are called genes.
Genes are present on chromosomes which in turn carry them from parent to progeny. Gametes formed in humans also follow the law of segregation and bear only one allele of each gene.
Two pairs of genes are independently segregated from each other which in turn leads to the production of parental as well as recombination gametes. Therefore, the concepts of genes, purity of gametes, the independent assortment of two pairs of genes, dominance are applicable to humans also.
Which of the choices below reflects the balance (or imbalance) between the direction and amount of fluid that flows across the capillary walls?
A. hydrostatic pressure only
B. plasma and formed element concentration
C. blood volume and viscosity
D. hydrostatic and osmotic pressure
Answer:
The correct answer is option - D. hydrostatic and osmotic pressure.
Explanation:
The hydrostatic pressure is the pressure that is produced by the fluid at a particular point due to gravity. The hydrostatic pressure takes the material out of the capillaries.
The osmotic pressure is the pressure that prevents a true solvent to flow inward a solution through the semi-permeable membrane. It takes the material back in the capillaries. Hydrostatic pressure at the side of the artery is more than osmotic pressure thus, the overall materials through the material across the capillaries walls.
Thus, the correct answer is option - D. hydrostatic and osmotic pressure.
The correct choice that reflects the balance between the fluid flow across capillary walls is the combined effect of hydrostatic and osmotic pressure. Hydrostatic pressure, influenced by the heart's pumping action, pushes fluids out, while osmotic pressure, driven by plasma proteins, pulls fluids back into the capillaries.
Explanation:The balance or imbalance between the direction and amount of fluid that flows across the capillary walls is reflected by both hydrostatic and osmotic pressure. Hydrostatic pressure, such as capillary hydrostatic pressure (CHP), is the pressure exerted by blood against the walls of blood vessels. Osmotic pressure, particularly blood colloidal osmotic pressure (BCOP) produced by plasma proteins such as albumin, draws fluid back into the capillaries. Together, these pressures determine the movement of fluid between capillaries and interstitial spaces.
At the arteriolar end of a capillary, hydrostatic pressure is typically higher than osmotic pressure, which pushes fluids and nutrients out of the capillaries. At the venular end, the hydrostatic pressure is lower than the osmotic pressure, which facilitates the re-entry of fluid into the capillaries. Capillary hydrostatic pressure and blood colloidal osmotic pressure can be described through values such as 35 mm Hg and 25 mm Hg respectively at different points along the capillary bed, revealing when filtration or reabsorption occurs.
Cholesterol is a ________, which ________. steroid; is a component of eukaryotic membranes steroid; is the basis for many animal and plant hormones terpene; is the basis for many animal and plant vitamins steroid; is a component of eukaryotic membranes and is the basis for many animal and plant hormones fatty acid; functions in energy storage
Answer:
Steroid; is a component of eukaryotic membranes.
Explanation:
Cholesterol is one of the most important chemical synthesized by all the animals. The chemical formula of cholesterol is C27H46O. The cholesterol in solid state was first given by C27H46O.
Cholesterol is present in the plasma membrane and maintain its membrane fluidity. Cholesterol is an important structure of the plasma membrane and acts as a pre cursor for various hormone. The cholesterol is a type of sterol and a lipid.
Thus, the correct answer is option (1).
EARTH SCIENCE
1. Select the correct answers from the list.
Scientists wondered how volcanoes could be located so far from tectonic plate boundaries until one proposed the idea of BLANK, where the magma is much hotter than the surrounding magma. These are BLANK and do not move with tectonic plates. They are responsible for the creation of BLANK island chains.
2. What main process do all volcanoes have in common, regardless of the specific ways they form?
a rising magma
b plate subduction***
c hotspots
d plate divergence
3. Describe how plant fossils found at Svalbard in Norway gave evidence of drifting continents.
a They were found only in that one location.
b They were plants that became extinct millions of years earlier.
c They were found in glacial deposits.***
d They were warm climate plants that would not grow in a cold polar area.
4. Which features would you look for to classify a volcano? Select the three correct answers.
a height*
b steepness*
c color
d type of lava
e presence of foliage*
f age of rock
5. What will happen where two continental plates collide at a convergent boundary?
a One plate is subducted beneath the other.
b The direction shifts and it becomes a transform boundary.
c The plates push up, forming a mountain range.***
d A volcanic island arc is formed.
Volcanoes, drifting continents, and classification of volcanoes.
Explanation:1. The correct answers are:
Hotspots Stationary Island chains
2. The main process that all volcanoes have in common, regardless of how they form, is rising magma.
3. Plant fossils found in glacial deposits at Svalbard in Norway provided evidence of drifting continents.
4. The features used to classify a volcano are height, steepness, and presence of foliage.
5. When two continental plates collide at a convergent boundary, the plates push up, forming a mountain range.
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Volcanoes can be located far from tectonic plate boundaries due to hotspots, which are fixed points responsible for island chains. All volcanoes have rising magma as a common process. Plant fossils in glacial deposits at Svalbard provided evidence of drifting continents. The height, steepness, and presence of foliage classify a volcano, and when two continental plates collide, a mountain range is formed.
Explanation:1. Scientists wondered how volcanoes could be located so far from tectonic plate boundaries until one proposed the idea of hotspots, where the magma is much hotter than the surrounding magma. These are fixed points and do not move with tectonic plates. They are responsible for the creation of island chains.
2. The main process that all volcanoes have in common, regardless of the specific ways they form, is a rising magma. This rising magma creates the pressure and heat necessary for volcanic eruptions.
3. Plant fossils found at Svalbard in Norway gave evidence of drifting continents because they were found in glacial deposits. This indicates that the location of Svalbard was once in a warmer climate, which aligns with the theory of continental drift.
4. The features to look for in order to classify a volcano are height, steepness, and presence of foliage. These characteristics can help determine the type and activity level of a volcano.
5. When two continental plates collide at a convergent boundary, the plates push up, forming a mountain range. The collision of the plates forces the land upwards, resulting in the formation of towering mountains.
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Waters high heat capacity protects organisms in the ocean from what?
Answer:
Heat fluctuations
Explanation:
Water's high heat capacity means that it requires a lot of energy to raise the temperature of a unit volume of water by one degree. It also requires to lose this same amount of energy to lower its temperatures by one degree.
This means that as land temperatures fluctuate a lot from day to night depending on the rate of sunlight hitting the earth, the waters of the oceans remain more or less within very a small range of temperatures. This protects the organism of the oceans from high heat fluctuations that may cause heat shock.
The cell ____________ acts as a selective barrier (or filter) regulating which compounds or particles dissolved or suspended in water are allowed to pass through the endodermis and into the vascular system.
Answer:
Membrane
Explanation:
A cell membrane is a protective layer for the cell, and this cell membrane is selectively permeable, meaning that is will let some things into the cell while keeping other things out.
The cell membrane is made up of a phospholipid bilayer which contains proteins which are involve in the transport of molecules in and out of the cell.
the cell membrane has several major roles:
It protects the cells from it's surroundings.It maintains an internal environment that is different from it's external environment.It determines which particles may enter and exit the cellWhat does the Peripheral Nervous System control ?
Some of your peripheral nervous system (PNS) is under your voluntary control - the nerves that carry instructions from your brain to your limbs, for example. As well as controlling your muscles and joints, it sends all the information from your senses back to your brain.
I copied this off a website but I checked my sources and you can always look it up too!!
Answer:
Digestion and temperature control.
Explanation:
Under your voluntary control there is some peripheral nervous system (PNS) - the nerves which helps in carrying the instructions from brain to limbs. For eg. while controlling your joints and muscles , it sends all the information to your brain from your senses. Brain automatically controls the other part of PNS.
Peripheral nervous system (PNS) is known as the autonomic nervous system. Without thinking it manages some things like digestion and temperature control.
A rain forest has a high level of biodiversity because it has
it has so much because it has a lot of animals with a lot of plants its habitats are very unique.
In bacteria, single polycistronic mRNA encodes for:
a. a single enzyme although there are many in the metabolic pathway.
b. multiple enzymes of the particular pathway.
c. a single mRNA which is split into multiple mRNAs before translation.
d. a single peptide with multiple catabolic sites.
e. none of the above.
Answer:
The correct answer is option b. "multiple enzymes of the particular pathway".
Explanation:
A polycistronic mRNA is defined as a single mRNA molecule that encodes for multiple proteins. Bacteria has developed the capacity of synthesizing polycistronic mRNAs from operon genes in order to encode for multiple enzymes of a particular biological pathway at the same time. This adaptation helps the bacteria to quickly start the biological pathway needed at the moment, which is particular useful when it faces stressful conditions.
The diagram above shows four steps in an attempt to investigate the release of gas during photosynthesis. Each setup was kept at 25 degrees C for 10 hours. What was the Independent Variable in this experiment?
a. temperature
b. water*
c. time
d. light
Answer:
light
Explanation:
The above experiment is an investigation on the factors that affect photosynthesis which include carbon dioxide concentration,light intensity and quality,chlorophyll, water and temperature.Light was the independent variable. When the lant is moved to an area where light intensity is low, the rate of photosynthesis decreases.
After the experiment, oxygen gas is produced being a by-product of photosynthesis. Plants that are not adapted to an aquatic environment are not suitable for this experiment. The amount of carbon dioxide dissolved in water is low.
Normal microbiota
A) indefinitely colonize the body.
B) take up residence in sites such as the colon and mouth.
C) almost always cause disease in the host.
D) are normally found in blood.
E) both indefinitely colonize the body and take up residence in sites such as the colon and mouth.
Answer:
E) both indefinitely colonize the body and take up residence in sites such as the colon and mouth.
Normal microbiota both indefinitely colonize the body and take up residence in sites such as the colon and mouth.
What is microbiota ?The set of microorganisms that are found in different parts of the body called as microbiota or microbiome, it shows symbiotic relationship between host and bacteria.
Bacteria help in digestion of food, produce vitamins and other compounds which we get from other sources, protect our body from colonization of other microorganism, functioning of physiological system,
The normal microbiota can be up two types such as Autochthonous microbiota live in our body for a prolonged period, participate in physiological processes and have evolved together with the species.
Allochthonous microbiota appear in any random habitat and appear accidentally or temporarily, don’t participate in physiological processes.
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WILL MARK BRAINLIEST MAX POINTS! Suppose a tropical storm hit your local coastal areas. Residents noticed a large amount of dead fish washed up on the beach following the storm. What physical factors of the aquatic ecosystem may have caused the fish die off?
Answer:
Maby cause it was a storm oil could ave leked nd killed the fish
During certain types of storms, the temperature can drop, killing and freezing the fish. This is the reason the dead fish were found by residents on the coast during the storm.
Cells may frequently find themselves in an environment with very low extracellular concentrations of substances needed in higher amounts inside the cell. To obtain these needed items, such cells would be most likely to engage in- osmosis.- simple diffusion.- facilitated diffusion.- active transport.
Answer:
Active transport is needed in that case
Explanation:
Substances must pass through plasmatic membrane to reach the cell content. There are different possible situations:
Osmosis: water is the molecule that crosses the membrane from a solution with low solute concentration to a space with higher solute concentration (down a concentration gradient) Simple diffusion: small molecules pass across the plasmatic membrane down a concentration gradient. Facilitated diffusion: bigger molecules pass across the plasmatic membrane down a concentration gradient but they need special channels to do it: proteins or protein-complexes in the membrane that facilitate the transport. Active transport: to move molecules against (up) concentration gradient, special proteins in cell membrane must use energy from ATP to bring this desired substances inside the cell.
To obtain these needed items, such cells would be most likely to engage active transport. last option is correct.
What is active transport?Active transport is described as the movement of molecules or ions across a cell membrane from a region of lower concentration to a region of higher concentrationagainst the concentration gradient. Cellular energy is needed for active transport in order to achieve this movement.
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When designing an experiment benefit of larger sample sizes would be more A.Variable data. C. time per groups B. representative. D. Control groups
Answer:
A
Explanation:
The benefits of larger sample sizes in experimental design include having more representative and variable data as well as having the capacity for more control groups.
Explanation:When designing an experiment, the benefit of larger sample sizes includes more representative data, more variable data, and more control groups. Firstly, a larger sample size is more representative because it encompasses a wider array of the population, increasing the chance that the results of the experiment will be applicable to the entire population. Secondly, larger sample sizes result in more variable data, which enables researchers to access a broader spectrum of responses. This leads to more perspective on the data, leading to a more comprehensive understanding of the topic. Lastly, larger sample sizes allow for more control groups which can verify results, reduce bias, and improve the reliability of findings.
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Sylvia needs 110 mL of a 34% acid solution in order to complete an experiment in chemistry lab. She makes the 34% acid solution from a mixture of a 62% acid solution and a 21% acid solution. Find the volume of the 62 % acid solution that Sylvia uses to make the mixture.
Answer:
Volume of [tex]62[/tex] % acid solution is [tex]34.878 mL[/tex]
Explanation:
The total weight of [tex]34[/tex] % mixture containing [tex]62[/tex] % and [tex]21[/tex] % solutions [tex]= 110[/tex] mL
Let the weight of [tex]62[/tex] % solution is equal to [tex]X[/tex] mL
then the weight of [tex]21[/tex] % solution is equal to [tex]110-X[/tex] mL
Arranging the given conditions in the form of equation, we get -
[tex]0.62 X + 0.21 (110 -X) = 0.34 * 110[/tex]
[tex]0.62 X + 23.1 - 0.21 X = 37.4\\0.62 X - 0.21 X = 37.4 - 23.1\\X = \frac{14.3}{0.41} \\X = 34.878[/tex] mL
The volume of [tex]62[/tex] % acid solution is [tex]34.878 mL[/tex]
In recent years, there has been controversy among biologists about whether Neanderthals should be placed within the same species as modern humans or into a separate species of their own. Most DNA sequence data analyzed at this point indicated that there was probably little or no gene flow between Neanderthals and Homo sapiens. Which species concept is most applicable in this example?
Answer:
The correct answer would be - biological species concept.
Explanation:
The biological species concept is a concept of speciation or how a species forms in nature. According to this, a species is the group of the population that can naturally or potentially interbreed with each other, not on the basis of their physical similarities or habitats.
The physical appearance could be useful as recognizing a species but not defining it. As neanderthals show very little or no gene flow with a modern human it means they do not belong to the same species as modern homo sapiens.
Thus, the correct answer is- biological species concept.
The biological species concept, focusing on reproductive isolation and interbreeding, appears relevant when considering the genetic relationship between Neanderthals and modern humans. However, evidence of gene flow suggests a more nuanced view, complicating a strict definition based on reproductive isolation.
Explanation:The question revolves around which species concept is most applicable when discussing the relationship between Neanderthals, Denisovans, and modern humans (Homo sapiens). The biological species concept, which defines species based on the ability to interbreed and produce fertile offspring, is relevant here. However, the evidence suggests that gene flow did occur among these groups, complicating the strict application of this definition.
DNA analysis indicates that modern humans have between 1 to 4 percent Neanderthal DNA, and some individuals also have Denisovan DNA. This gene flow is evidence of interbreeding among these Homo species. The presence of Neanderthal DNA in modern humans challenges the notion of Neanderthals being a completely separate species, suggesting that they may have been absorbed by the Homo sapiens population.
Some antibiotics bind to the bacterial enzyme, _____, which effectively stops bacterial growth because bacteria need this enzyme to complete replication. Eukaryotic cells are not harmed because they are linear and don't use the same type of this enzyme.
Answer:
bacteria
Explanation:
because the bacteria only enzyme