Answer:
Organisms that reproduce together to form fertile offspring
Explanation:
The best definition of species is the organisms that reproduce together to form fertile offsprings. Therefore, the correct option is D.
What are species?Species refers to the related organisms that are similar in form and function and are capable of interbreeding to form fertile offsprings.
The concept of species is the fundamental unit of classification in biology and is used to organize the diversity of the life into a manageable and scientifically useable system.
Species are typically defined based on their genetic, morphological and behavioral characteristics.
For example- Two organisms are said to be of the same species if they have a similar DNA sequence, look alike and can interbreed to produce offspring of that are also capable of reproducing.
In conclusion, species are the key unit of classification in biology. Therefore, the correct option is D.
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If the population density of a certain marine species is 3 per cubic meter of water, then what is the total population of the species in a body of water that is 1,000 cubic meters in volume?
Answer:
[tex]3000[/tex]
Explanation:
Given
Population Density of marine species population [tex]= 3[/tex] cubic meter of water
Total volume of water [tex]= 1000[/tex] cubic meters
The number of species in a given habitat
[tex]= p_d * S[/tex]
Where [tex]p_d[/tex] is the density of population per unit area or volume
S is the size of habitat for a given population. It can be area , volume or any other unit of measurement.
Substituting the given values in above equation, we get -
[tex]3*1000\\= 3000[/tex]
Answer:
a. 3000
Explanation:
Norway rats have 42 chromosomes in their diploid cells. If a diploid rat cell enters meiosis, how many chromosomes and double-helical molecules of DNA will be present in each daughter cell at the end of meiosis II?
Answer:
21 chromosomes
Explanation:
Meiosis is a type of cell division that produces 4 haploid daughter cells (i.e., gametes) from a single diploid cell. This parental cell undergo one (1) cycle of DNA replication and two (2) cell divisions, thereby, in the case of the Norway rats that have 42 chromosomes, the final number will be 21 (21 x 2= 42)
Answer:
21 chromosomes and 21 molecules of DNA at the end of meiosis II
Explanation:
The end of meiosis II that occurs on each cell will give rise to four mature cells, or gametes, and each cell will have 21 chromosomes because the number of each cell has to be half of the initial diploid cell to allow the correct number after the formation of the zygote. Each cell will also contain 21 molecules of DNA because the mature cell after the meiosis has to be haploid.
Question 22 of 25
2 Points
Which of the following are responsible for sending messages from the
hypothalamus to the thalamus?
O
A. Sensory neurons
B. Motor neurons
O
C. Interneurons
O
D. Hormones
Answer:
its interneurons
Explanation:
its interneurons
Interneurons are responsible for sending messages from the hypothalamus to the thalamus. Therefore, the correct statement is option C.
What are interneurons?Interneurons act as an intermediate between sensory neurons, which are responsible for transmitting information from sensory receptors present in the body to the central nervous system, which further transmits signals from the central nervous system to muscles to produce a response.
Interneurons transmit the messages among different neurons present within the central nervous system and also from the hypothalamus to the thalamus. The hypothalamus constitutes the small part of the brain and regulates various functions, such as temperature control, hunger, etc.
The thalamus is also another part of the brain acting as a relay station for sensory information from the body to the cerebral cortex. The interneurons connect the hypothalamus and the thalamus and transmit information so the hypothalamus and the thalamus can perform their functions properly.
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Where are the alleles for each parent written when using a Punnet square?
A. Across the top and along the side of the grid
B. In the top two squares of the grid
C. In the bottom two squares of the grid
D. Only at the bottom of the grid
When a potassium ion (K+) moves from the soil into the vacuole of a cell on the surface of a root, itmust pass through several cellular structures. Which of the following correctly describes the order inwhich these structures will be encountered by the ion?
A) plasma membrane → primary cell wall → cytoplasm → vacuole
B) secondary cell wall → plasma membrane → primary cell wall → cytoplasm → vacuole
C) primary cell wall → plasma membrane → cytoplasm → vacuole
D) primary cell wall → plasma membrane → lysosome → cytoplasm → vacuole
E) primary cell wall → plasma membrane → cytoplasm → secondary cell wall → vacuole
Answer:
C) primary cell wall → plasma membrane → cytoplasm → vacuole
Explanation:
Structurally from the soil into the roots, the structure of the root cells is such a way that k+ enters with water through the primary cell wall → plasma membrane → cytoplasm → vacuole of the root hairs, and move through apoplastic and sympathic pathways from the root hairs .
From the root hairs they moved in mass flow in the xylem vessels. They reentered apoplastic and sympathic pathways again to reach different parts of the plants.
Due to the facts that K+ in the roots cells are of lower water potential,soil water K+ can also move by active transport and facilitated diffusion from the soil into the (primary cell wall → plasma membrane → cytoplasm → vacuole roots,) and later switch to apoplastic and sympathic pathways to reach plant parts.
A potassium ion moving from the soil into a plant cell first encounters the primary cell wall, then the plasma membrane, followed by the cytoplasm, and finally it reaches the vacuole. Hence, the correct sequence is primary cell wall → plasma membrane → cytoplasm → vacuole. Hence the correct option is (C).
Explanation:When a potassium ion (K+) moves from the soil into a plant root cell, the order in which it encounters the cellular structures is important. The correct sequence is as follows: the potassium ion first interacts with the primary cell wall, which is the outermost layer.
Following this, it passes through the plasma membrane, which regulates the movement of substances into and out of the cell. After crossing the plasma membrane, it moves through the cytoplasm of the cell, which is the substance inside a cell where most of the cell's metabolic reactions occur.
Finally, the potassium ion reaches the vacuole, a cellular organelle that stores nutrients and aids in waste disposal. Therefore, option C) primary cell wall → plasma membrane → cytoplasm → vacuole describes the correct order of structures encountered by the ion.
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What is Collenchyma?
Answer:
It is a tissue that consists of living cells that are thickened at all over the corners by the deposition of extra cellulose, to provide support and mechanical strength. They are usually polygonal elongated cells with tapering ends.
Collenchyma is found in the primary tissues of the plant. It is therefore, an important supporting tissue in young plants, herbaceous plants or plant organs, such as leaves, in which secondary growth does not occur.
Answer:
A Collenchyma is essentially a form of tissue that is bolstered by the condensing/thickening of cell walls.
A woman with brown eyes, which has two brothers, marries a man with brown eyes, which has a brother and two sisters, and produces a boy with brown eyes. When their son marries a woman with blue eyes, they have a girl with blue eyes. All of the boy's aunts and uncles have brown eyes, as do his grandparents. However, his mother, the little girl's grandmother, has an uncle with blue eyes. Trace the family history of eye color and determine how the little girl could have blue eyes.
Answer:
A. The man's genotype is Bb. Phenotypes of the offsprings:- heterozygous brown-eyed- homozygous blue eyedGenotypes of the offsprings:- Bb- bbb. The blue is recessive, so the woman's genotype is bb. It is impossible for her to have B because it is dominant over b.c. The woman can only produce bb or blue-eyed.d. The man's genotype is Bb. It is impossible for him to produce an offspring with blue-eyes if his genotype is BB.e. The man can produce Bb or brown-eyed and bb or blue-eyed.
Explanation:
(ASAP PLEASE) Dichotomous key of brewer’s yeast (saccharomyces cerevisiae) e. coli bacteria (escherichia coli) green hydra (hydra viridissima) house cat (felis catus)
Answer:
Does the organism have legs?
Does the organism reproduce asexually?
Can the organism ferment?
Is the organism infectious?
Explanation:
The questions HAVE to be yes or no, in order for it to effectively determine which species is which.
Answering a sequence of questions based on opposing qualities (such physical attributes) that have two viable answers is a technique used to identify a species.
What is Dichotomous key of plants and animals?An instrument known as a dichotomous key is used to recognize living things or inanimate objects found in the natural world, such as plants, animals, or rocks.
The key is made up of a sequence of paired assertions or hints regarding traits or qualities that operate as a step-by-step manual for recognizing each thing.
Therefore, Dichotomous key of brewer’s yeast (saccharomyces cerevisiae) e. coli bacteria (escherichia coli) green hydra (hydra viridissima) house cat (felis catus)
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Now, suppose Lauren wants to buy exactly 2 bracelets and 2 other pieces of jewelry. There are ways to select 2 bracelets. There are ways to select 2 pieces of jewelry that are not bracelets.
Answer:
There are 15 ways to select 2 bracelets.
There are 10 ways to select 2 pieces of jewelry that are not bracelets.
How many ways can Lauren select 4 pieces of jewelry, of which exactly 2 are bracelets?
150
hopes this helps :)
Explanation:
The question relates to the mathematical field of combinatory, particularly combinations. To find the total ways Lauren can choose her jewelry, we use the formula '(n choose 2) * (m choose 2)', where n is the number of bracelets and m is the number of other jewelry items.
Explanation:The subject of this question appears to be related to combinatorics, specifically, combination. If we suppose that there are 'n' bracelets and 'm' pieces of jewelry that aren't bracelets, Lauren has 'n choose 2' ways to select the bracelets and 'm choose 2' ways to select the other pieces of jewelry. Therefore, the total number of ways in which Lauren can choose her jewelry is the product of the two, i.e., '(n choose 2) × (m choose 2)'.
For example, if Lauren has 3 bracelets and 4 other types of jewelry to choose from, she can select the bracelets in '3 choose 2' = 3 ways, and the other pieces of jewelry in '4 choose 2' = 6 ways. Thus, she has a total of 3×6 = 18 possible ways to choose 2 bracelets and 2 other pieces of jewelry.
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Which organelle is most like a factory delivery driver?
Answer:
ER
Explanation:
ER=endoplasmic reticulum
Answer:endoplasmic reticulum
Explanation:
Which are characteristics of natural selection? Select three options.
Answer:
1) reproduction, heredity,
2) variation in fitness or
30 organisms,
4) variation in individual characters among members of the population. If they are met, natural selection automatically results.
Explanation:
Which characteristic would most likely remain constant when a limestone cobble is subjected to extensive abrasion?
1)Shape
2)Mass
3)Composition
4)Volume
Answer:
Which characteristic would most likely remain constant when a limestone cobble is subjected to extensive abrasion
Composition
Explanation:
The constituents of cobble still remain irrespective of the extensive abrasion that it might be done on it. the composition remain the same
Which characteristic cannot be inherited?
O color of an animal's fur
O height of a plant
O knowledge of facts
O shape of a face
Answer:
The characteristic of Knowledge of facts cannot be inherited.
Explanation:
Describe the trends in the wildebeest population over time when compared to the population affected by rinderpest disease
Answer:Eradication of the virus allowed the wildebeest population to rebound from around 200,000 animals in 1958 to around 1,200,000 in the late 1970s. Following this steep increase, the population stabilized.
Explanation:
The trends in the wildebeest population over time when compared to the population affected by rinderpest disease is maybe reproduction of the wildebeest after rinderpest vaccination worked on them.
What is the rinderpest?Cattle, wildebeest, and other animals with feet are susceptible to the viral disease known as rinderpest. For many years, the Serengeti region's cattle and wildlife had been afflicted by the disease.
My initial hypotheses for why the trends in the wildebeest and buffalo populations resemble each other are that both animals rose over time as a result of rinderpest vaccination or treatment, which boosted the trends for both animals.
Therefore, after the virus was eradicated, the wildebeest population recovered, increasing from 200,000 animals in 1958 to 1,200,000 in the late 1970s. The population stabilized after this abrupt rise.
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Jillian made a model of an animal cell. She used a round balloon to represent the cell membrane. She pushed objects like marbles and rocks into the balloon to show cell parts, then filled it with water to show fluid inside the cell.
What is a limitation of Jillian's cell model?
It does not make up the tissues of a living thing.
It does not show the functions of the cell parts.
It is larger than a real animal cell.
It is more complex than a real animal cell.
Answer: b because the bee from my pet bee hive said so
Explanation:
Answer:
B
Explanation:
Whith observation supports the inference that humans and chimpanzee share a common ancestor?
Chimpanzees and humans eat fruit, meat, and vegetation.
Chimpanzees and humans have five-toed feet and backbones.
Chimpanzees and humans have nearly identical DNA.
Chimpanzees and humans live in the same time period.
Answer:
The correct answer is C.) Chimpanzees and humans have nearly identical DNA.
What can you conclude about the classification of silicon?
A) Silicon is a noble gas and has a full valence electron shell, is chemically non-reactive, colorless, odorless, and is a gas at room temperature.
B) Silicon is a metal and is shiny, malleable, ductile, conducts heat and electricity, forms basic oxides, and forms cations in aqueous solution.
C) Silicon is a nonmetal and is dull, brittle, poor conductor of heat and electricity, forms acidic oxides, and forms anions in aqueous solution.
D) Silicon is a metalloid and has properties of both metals and nonmetals - it appears lustrous, but is brittle and a poor conductor of heat and electricity.
Answer:
d
Explanation:
its on the staircase of the periodic table
Final answer:
Silicon is a metalloid with properties of both metals and nonmetals. It's shiny and lustrous yet brittle and a poorer conductor, making it valuable as a semiconductor in technology. (Option D)
Explanation:
Regarding the classification of silicon, it is a metalloid, which means it exhibits properties of both metals and nonmetals. Silicon is known to be shiny and lustrous like a metal but is also brittle and not as good a conductor of heat and electricity as metals.
These unique characteristics allow silicon to be used as a semiconductor, which is crucial in the technology industry, especially for creating integrated circuits and solar cells. Additionally, silicon can form tetrahedral structures and is capable of expanding its valence shell, differentiating it from its periodic group members.
A mutation occurs in an original DNA template that changes the DNA, changes the RNA, but does not change the protein sequence. What kind of mutation is this. and what would be the consequence of this original change?
Answer:
The changes that do not affect the function of a protein are called silent mutations.Explanation:
As given here as a mutation occurs in an original DNA template that changes the DNA, by transcription this mutation passes into RNA and changes the RNA, but it does not change the protein sequence, it means that this mutation could be silent mutation.
Silent mutation is the mutation which cause the change of a base in that, after the mutation the codon codes for the same amino acid, or the amino acid which do no cause any change in the protein, hence these changes do not affect the function of a protein.
A silent mutation is a type of mutation that does not change the protein sequence. It has no significant impact on the function or phenotype of the organism.
Explanation:
The mutation described in the question is a silent mutation. This type of mutation occurs when a change in the DNA sequence does not result in a change to the amino acid sequence of a protein. It typically involves a substitution of one nucleotide for another, which still codes for the same amino acid. As a result, the protein sequence remains unchanged.
The consequence of this original change is that there would be no significant impact on the function or phenotype of the organism. Silent mutations are often considered neutral mutations because they do not affect the protein's structure or function. They can accumulate in a population over time without causing any noticeable changes.
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Which of these diseases can be spread?
Answer:
yeah bro what diseases you didnt list any
Explanation:
What happens to salivary amylase when it arrives with the bolus in the stomach? Because of this, what happens to carbohydrate digestion? (Hint: Look up the optimum pH for amylase and what is the pH of the gastric juices)
Answer:
Salivary amylase becomes inactive in stomach. Carbohydrate digestion halts until the bolus enters small intestine.
Explanation:
Salivary amylase is present in saliva and breaks down starch in food thus it helps in carbohydrate digestion. The optimum pH for its working is 6.8. As the bolus enters the stomach, pH drops drastically. Gastric juice has pH around 3. Salivary amylase is not able to function in such a low pH and becomes inactive in stomach. As a result, carbohydrate digestion halts in stomach. Gastric juice has its own amylase but it does not digest the starch much.
As the bolus enters the small intestine, the acidic pH is restored to neutral value. Carbohydrate digestion restarts with the help of pancreatic amylase.
Explain why autotrophs are on the bottom of the energy pyramid.
Answer:
Because Primary producers like plants are capable of making their own energy from the sun.
Explanation:
Producers make up the bottom of a pyramid. There are many organisms that feed on these producers and use their energy in their own biological processes. These organisms are higher in the pyramid.
Autotrophs are on the bottom of the energy pyramid; Because Primary producers like plants are capable of making their own energy from the sun.
Why do autotrophs always occupy the lowest level?The sun's energy is converted into biomass by autotrophs, the producers in a food web.
Each of the trophic level results in a drop in biomass. The Lower trophic levels always have more biomass than higher trophic levels.
Autotrophs are able to produce their food through photosynthesis; which means they provide food for all other creatures.
The Producers make up the bottom of a pyramid. There are lots of organisms that feed on these producers; use their energy in their own biological processes. These organisms are higher in the pyramid.
Autotrophs are on the bottom of the energy pyramid; Because Primary producers like plants are capable of making their own energy from the sun.
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Describe how increasing salinity affects the amount of fluid ejected each time a contractile vacuole contracts. Calculate the water potential ( Ψ ) of an animal cell without contractile vacuoles if water enters the cell and creates a solute potential ( ΨS ) of −2 . Assume that the pressure potential ( ΨP ) in the cell is 0.
Answer:
Water potential [tex]= -2[/tex]
Explanation:
As we know,
Water potential is equal to the sum of pressure potential and solute potential
Ψ [tex]=[/tex] ΨS [tex]+[/tex] ΨP
Where Ψ is the water potential
ΨS is the solute potential
ΨP is the pressure potential
Given -
Solute potential ( ΨS ) [tex]= -2[/tex]
Pressure potential ( ΨP ) [tex]= 0[/tex]
Substituting the given values, we get -
Ψ [tex]=[/tex] [tex]- 2 + 0[/tex]
Ψ [tex]=[/tex] [tex]- 2[/tex]
(a) Increased salinity will affect the amount of fluid ejected each time a contractile vacuole contracts because the surrounding water becomes more hypertonic as salinity increases.
As hypertonicity of the surrounding medium increases, water potential decreases, and more water will be ejected from the contractile vacuole to the surrounding medium as a result of osmosis.
(b) From the formula:
water potential ( Ψ ) = solute potential ( ΨS ) + pressure potential ( ΨP )
In this case, ΨS= -2 and ΨP = 0
Therefore:
Ψ = -2 + 0
= -2
Thus, the water potential of the animal cell without contractile vacuoles if water enters the cell and creates a solute potential ( ΨS ) of −2 would be -2.
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Landscapes will undergo the most chemical weathering if the climate is *
A)cool and wet
B)warm and wet
C)cool and dry
D)warm and dry
Answer:
C.) Warm and wet
Explanation:
Warm and wet is the most logical because increased moisture and temperature directly affects the speed of which natural chemical reactions in rocks, for example, hydrolysis.
Answer:
Landscapes will undergo the most chemical weathering if the climate is
cool and wet
Explanation:
Erosion caused by chemical disintegration which only happens only when the climate is cool and wet
A laboratory mouse homozygous for a specific allele is mated to a wild mouse that is heterozygous for that allele. One of the heterozygous individuals resulting from this cross is mated back to the wild field mouse parent. What proportion of the offspring will have the same genotype as the original laboratory mouse?
Answer:
A laboratory mouse homozygous for a specific allele is mated to a wild mouse that is heterozygous for that allele. One of the heterozygous individuals resulting from this cross is mated back to the wild field mouse parent. What proportion of the offspring will have the same genotype as the original laboratory mouse?
RR x Rr= RR, Rr, RR, and Rr 4:0 genotype
Rr x Rr= RR, Rr, Rr and rr 2:2 50:50%
50% of the offspring will have the same genotype as the original laboratory mouse
Explanation:
How do viruses reproduce?
a. By mitosis
b. By meiosis
c. By infecting living cells
d. Sexual reproduction
Answer:
c. By infecting living cells
Explanation:
c. By infecting living cells
Answer:
By infecting living cells
Explanation:
hope this helps
In your own words, please explain why does the ocean crust sink?
(Note- The image below should be able to help you out a bit if you're having trouble)
Answer:
Explanation:
oceanic crust sinks because it is denser and has higher specific gravity than the more silicon aluminum enriched continental crust.
Eric made a physical model of a cell membrane by putting one zip-top plastic bag inside another. He punched some straws through the plastic so that they led from outside the outer bag to the inside of the inner bag.
Which of the following features of a cell membrane can be seen using Eric's physical model?
Proteins and other molecules can move around within the cell membrane.
A cell membrane is made of two layers.
Some molecules can pass directly through the cell membrane.
Pores and proteins in the cell membrane allow passage through it.
Answer:
A cell membrane is made of two layers.
The cell membrane is composed by a phospholipid bilayer where the interior side is hydrophobic and non-polar, while the outside is hydrophilic and polar
Pores and proteins in the cell membrane allow passage through it.
The pores and proteins in the cell membrane have several functions such as, for example, cell signaling (proteins) and selective transport (pores)
Pores and proteins in the cell membrane allow passage through it.
A cell membrane is made of two layers.
Describe how humans and dolphins are in competition with one another.
Answer:
For food
Explanation:
Dolphins are aquatic animals while Man are terrestrial beings. Man controls almost all the regions of the earth and get food from both land and water.
The Dolphins gets its food to stay alive by feeding on other small aquatic animals such as fish, shrimp, etc . These foods are also well sought by man which brings a certain type of competition for these sea foods between Man and Dolphins.
Answer:
Humans and dolphins are competing with each other in the predation of aquatic animals.
Explanation:
As you may already know, the dolphin is an aquatic animal that feeds on smaller fish, shrimp and some other marine products. Dolphin feeding reduces the amount of marine animals that humans can fish for food.
In addition, dolphins establish some damage to fishermen, as they can curl up in fishing nets and tear them, making them unsuitable for fishing.
How is diversity in a population created? (For people)
Answer:
Mutations are changes to an organism's DNA that create diversity within a population by introducing new alleles. Some mutations are harmful and are quickly eliminated from the population by natural selection; harmful mutations prevent organisms from reaching sexual maturity and reproducing.
Explanation:
Explanation:
Mutations are changes to an organism's DNA that create diversity within a population by introducing new alleles.
A patient is concerned about a dark skin lesion on her anterolateral abdomen. It has not changed, and there is no discharge or bleeding. On examination there is a medium brown circular lesion on the anterolateral wall of the abdomen. It is soft, has regular borders, is evenly pigmented, and is about 7 mm in diameter. What is this lesion?
A)Melanoma
B)Dysplastic nevus
C)Supernumerary nipple
D)Dermatofibroma
Final answer:
The skin lesion described is probably not melanoma due to its regular borders and uniform pigmentation. It is more likely to be a dermatofibroma due to its benign characteristics. The correct answer is: D) Dermatofibroma
Explanation:
The lesion described in the question is a medium brown circular lesion with regular borders, evenly pigmented, and approximately 7 mm in diameter. According to the ABCDs of skin cancer, concerning characteristics include asymmetry, irregular borders, varied colors, and a diameter greater than 6 mm. Additionally, evolving shape and elevation are signs to watch for. The lesion here does not fit these criteria well, thereby making melanoma (option A) less likely. A dermatofibroma often presents as a firm, benign skin lesion with a smooth or slightly irregular border, varying in color from brown to pinkish, and they can sometimes be mistaken for moles. Dermatofibroma is a more appropriate diagnosis given the described characteristics.