Answer:
Taq polymerase comes from thermophilic bacterium.Explanation:
Taq polymerase is a heat-stable DNA polymerase , an enzyme, and it comes from the thermophilic bacterium, which inhabits hot springs and hot areas.
It was originally isolated from thermophilic bacterium and was named as Thermus aquaticus (T. aquaticus)
This enzyme is heat stable and do to denature easily.
Taq polymerase is very usefull in PCR. Through PCR we can make large number of DNA from a small sample in a very short time.
The m phase checkpoint ensures that all chromosomes are attached to the mitotic spindle. If this does not happen, then
Answer:
The cells would most likely get arrested in the metaphase stage.
Explanation:
Certain points found in the cell cycle of eukaryotes, at which the advancement of the cell to the next stage of the cycle can be prevented until and unless all the conditions become favorable are known as the check points. One of these checkpoints is the M checkpoint, which is found close to the termination of the mitosis metaphase stage.
It is also known as the spindle checkpoint as it determines the accurate attachment of the sister chromatids with the spindle microtubules. At the time of the anaphase stage, the distinction of the sister chromatids is an irreversible step, thus, unless and until each sister chromatids pair are attached strongly with the spindle fibers originating from the reverse poles of the cell, the cycle will not progress further.
Therefore, if all the chromosomes are not attached to the mitotic spindle the M checkpoint will not allow the cell to go the next stage and will arrest the cell in the metaphase stage.
The M phase checkpoint ensures that all chromosomes are attached to the mitotic spindle. If this does not happen, then the cell will be arrested in metaphase.
The cell cycle can be divided into interphase and a mitotic 'M' phase in which the cell divides. The M phase can in turn be divided into prophase, metaphase, anaphase and telophase.The M checkpoint ensures the correct attachment of chromosomes to the mitotic spindle. During metaphase, the chromosomes align at the equator (middle) of the cell.In conclusion, the M phase checkpoint ensures that all chromosomes are attached to the mitotic spindle. If this does not happen, then the cell will be arrested in metaphase.
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"" Generally, a very _______ percent of Na + in the tubular fluid is reabsorbed, and the reabsorption takes place ________.
high, only in the nephron loop
high, along the entire tubule
small, only in the nephron loop
small, along the entire tubule
Answer:
high, along the entire tubule
Explanation:
In rats, the allele for long whiskers is dominant to the allele for short whiskers. At another gene locus, a dominant allele produces whiskers and the recessive allele produces a rat with no whiskers. The alleles at these 2 gene loci assort independently. Two rats that are heterozygous at both gene loci are crossed. What percentage of the offspring do you expect will have whiskers? ( Enter the number only without the percent sign. For example, enter 100% as 100 and enter 12.5% as 12.5 )
Answer:
25
Explanation:
if you make a punnet square you will see that the allele for having whiskers is 25%
In which of the cultures was the concentration of toxins the highest?
True or false: The body temperatures of island tortoises always closely match the temperatures in their environments. True or false: The body temperatures of island tortoises always closely match the temperatures in their environments. True False
Explanation:
The given statement is false because tortoise is an ectotherm which means they change their temperature according to the change in external environment
The body temperature of ectotherms does not necessarily match the ambient temperature
For example, if a tortoise is basking in a sunny field, the solar radiation might raise its body temperature well above ambient, and the tortoise's low surface area/volume ratio would cause it to retain that heat for a long time
suppose you found a bone of a mastodon which had 6.25%c14and93.75%n14 how long ago did this animal die
Answer:
t= 3886.18 years old
Explanation:
Whenever an animal dies de C14 and N14 begin to disintegrate in such a way that the proportion between C14 and C12 decreases, with a semi-disintegration period of 5.730 years, T. To get to know how long it takes an element to disintegrate, we must use this semi-disintegration period, which is the time it takes until the amount of the element is reduced to its half.
We can find the age of the fossil, t, by using the next formula:
t = - (T x ln (C14))/ ln (2)
t = - (5730 x ln (0.625)/0.693
t= - (-2693.12)/0.693
t= 3886.18
Radiocarbon dating is the process of determining the age of organic material or fossils by using the radioactive isotope of carbon.
The period or the age of the animal is 3886.18 years old.
The radioactive isotope of carbon and nitrogen is used to date the age of a fossil.
Organic compounds like carbon and nitrogen start to degrade. The proportion between the isotopes of carbon, carbon-14, and carbon-12 decreases, it takes a semi-disintegration period of 5.730 years.
The time taken to semi-disintegrate the fossil is the time taken by the compound to reduce to half.
The age can be calculated by:
[tex]\text t &= \dfrac{\text T \times \text {ln (C14)}} {\text {ln (2)}}\\\\\\\text t &= \dfrac{5730 \times \text {ln (0.625)}} {0.693}\\\\\\\text t &= \dfrac{-2693.12}{0.693}\\\\\text t &= 3886.18[/tex]
Therefore, the age of the fossil is 3886.18
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In land mammals, the pelvic girdle is the point where the leg bones attach to the rest of the skeleton. Whales also have a small pelvic girdle. What type of evidence for common descent would include the whale's pelvic girdle?
A. a homologous gene
B. a homologous structure
C. fossil evidence
D. a vestigal structure
Answer:
D. a vestigal structure
Explanation:
The type of evidence for common descent that would include the whale's pelvic girdle is vestigeal structure.
Vestigeal structures are small, degenerated and non-functional organs found in organisms which are believed to have been well developed and functional in their ancestors.
The pelvic girdle in whales are considered to be vestigeal organs because they serve no known purpose and looks degenerated. Hence, they serve as evidence for common descent of mammals from the same ancestors.
The correct option is D.
Which organelle contains both DNA and RNA?
nucleus
ribosome
mitochondria
Golgi apparatus
Answer:
Nucleus
Explanation:
The nucleus is the organelle that contains the genetic material of eukaryotic organisms. That is, the DNA is contained in the nucleus while RNA is formed in the nucleus and transported out of the nucleus into the cytoplasm. This means the DNA and RNA can be present in the nuclues at the same time.
Light waves travel and strike a mirror. If the angle of incidence is 30°, what is the angle of reflection?
30°
180°
150°
60°
Several types of plant species grew in an empty lot. The city counsel decided to turn the lot into a park and planted grass alone to create a playing field. The ecological factor that was MOST LIKELY affected by the change was the lots ___________.
Answer:
Biodiversity
Explanation:
In the given question, many species of plant species used to grow in the empty lot. The plant species could have provided a home to many animal species. This lot thus formed a small level of the biological ecosystem which is composed of biodiversity.
This lot was changed to a park by the city council which then changed the ecosystem of the area and the main factor that was affected by this change is Biodiversity.
Thus, Biodiversity is correct.
Final answer:
The transformation of a diverse lot into a grass playing field likely most affected the lot's biodiversity, which impacts ecosystem processes, nutrient cycling, and interactions with insect predators.
Explanation:
The ecological factor that was most likely affected by the change from an area with several plant species to a park planted with grass alone for a playing field was the lot's biodiversity. The conversion to a grass field would lead to a significant loss in plant species diversity. This, in turn, can affect various ecosystem processes such as litter decomposition, nutrient cycling, and the presence of insect predators. Moreover, such changes could spill over and affect adjacent areas through altered biophysical processes and biodiversity, given that urban parks can support different species, including butterflies in the case of adjoining forests.
Mendel found that yellow pea pod color (G) was dominant to green pea pod color (g), and that round seeds (W) were dominant to wrinkled seeds (w). What percentage of each of the phenotypes below are expected from the following cross? GGWw x ggww
A.
0%
B.
25%
C.
33%
D.
50%
E.
66%
F.
75%
G.
100%
Yellow and wrinkled
Green and round
Green and wrinkled
Yellow and round
2. You ran an experiment in lab using four different restriction enzymes, each with a different sized recognition sequence. You used a 4-cutter, 6-cutter, 8-cutter, and 10-cutter. Your resulting gel looked like the one above. Which well contains the 8-cutter?
1. Mendel found that yellow pea pod color (G) was
A.
2
B.
3
C.
4
D.
5
Answer:
1) 50% of the progeny will be yellow and rounded, G-W-
50% of the progeny will be yellow and wrinkled, G- ww
0% of the progeny will be green and rounded, ggW-
0% of the progeny will be green and wrinkled, ggww
2) The well 5 will contain the 8-cutter
Explanation:
1) Available data:
yellow pea pod color (G) is dominant to green pea pod color (g) round seeds (W) are dominant to wrinkled seeds (w)Cross: GGWw x ggww
Parental) GGWw x ggww
Gametes) GW GW Gw Gw
gw gw gw gw
Punnet Square) GW GW Gw Gw
gw GgWw GgWw Ggww Ggww
gw GgWw GgWw Ggww Ggww
gw GgWw GgWw Ggww Ggww
gw GgWw GgWw Ggww Ggww
F1) 8/16 = 4/8 = 2/4 = 1/2 GgWw
8/16 = 4/8 = 2/4 = 1/2 Ggww
50% of the progeny will be yellow and rounded, G-W-
50% of the progeny will be yellow and wrinkled, G- ww
0% of the progeny will be green and rounded, ggW-
0% of the progeny will be green and wrinkled, ggww
2) The well 5 will contain the 8-cutter
Following the Mendelian genetics inheritance, ALL the offspring resulting from the cross between GGWw x ggww would have Green and wrinkled phenotype (100%). The restriction enzyme question cannot be answered due to the lack of provided gel image.
Explanation:When cross-breeding occurs between organisms with the genotype GGWw and ggww, it's important to understand the results are influenced by the principles of Mendelian genetics where 'G' is dominant, representing yellow peapod colour and 'g' is recessive, representing green peapod colour. Similarly for seeds, 'W' symbolizes round (dominant) and 'w' for wrinkled (recessive).
The offspring from this mating will have a 100% probability of possessing the green peapod and wrinkled seeds phenotype. This is because the 'gg' genotype (green) from the second parent will only display green as it's recessive and the presence of even one 'w' allele (wrinkled) from either parent would result in wrinkled seeds - a distinctive feature of incomplete dominance. Hence, options 'A' through 'G', the correct answer for the phenotype contributions is 'G. 100% - Green and wrinkled'.
The second question about restriction enzyme cannot be properly answered because the gel image is not provided. The distinction between the wells is usually determined by the number of cut sites or the pattern of bands in the gel.
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In the transition from rest to moderate exercise, ________________ supplies almost all of the energy. A) glycogen stored in the liver B) glycogen stored in active muscle C) free fatty acid circulating in the blood D) triacylglycerol stored in adipocytes
Answer:
glycogen stored in the liver
The free energy for the oxidation of glucose to CO₂ and water is -686 kcal/mol and the free energy for the reduction of NAD+ to NADH is +53 kcal/mol. What is the main reason that only two molecules of NADH formed during glycolysis when it appears that as many as a dozen could be formed?
Answer: The main reason why only 2 molecules of NADH is formed during glycolysis when it appears that as many as a dozen could be formed is because during glycolysis,most of the free energy that are available from the oxidation of glucose remains in one of the products of glycolysis known as pyruvate which acts like glucose but doesn't undergo metabolism.
Glycolysis is the splitting of sugar molecules into useable/ manageable forms,it can also be seen as the aerobic catabolism of sugar inorder to produce energy in the form of ATP,NADH and PYRUVATE.The following are the products of glycolysis; pyruvate,2 molecules of ATP and 2molecules of NADH.
Pyruvate are used in aerobic respiration or anaerobic respiration if oxygen is not available.
Which types of carbon-based molecules can be broken down to make ATP?
Answer:
Carbohydrates. Depending on the carbon-based molecule broken down, the amount of ATP produced will be less or more.
Explanation:
Anyone know this?????
Answer:
Please see the attached photo for a filled-out worksheet!
Explanation:
Do you think Peacocks would be in Hardy-Weinberg Equilibrium? Why or why not?
Peacocks would not be in Hardy-Weinberg Equilibrium
Explanation:
This can be justified by the mating patterns of the female peacocks. They do not choose their mates randomly but look out specifically for bright attractive plumage in their male partners and then select them.
Hardy-Weinberg's Equilibrium of evolution mechanism was based on facts like random mating, no natural selection, mutation, absence of gene flow, and infinite population size.
They stated that organisms mate randomly with each other without any specific or a particular preference in the phenotypes of their opposite mates
How might the populations living in the communities affected first by drought and then by wildfires be impacted over time?
Answer:
Truthfully all animals in that certain communities would be affected they all depend on everything in their communities.
Explanation:
During which phase of mitosis do sister chromatids separate?
Answer:
I think Anaphase II
Explanation:
Hope this help
Sister chromatids separate during the anaphase phase of mitosis. This critical phase ensures that each new cell has a precise copy of the genetic material contained in the original cell.
Explanation:Sister chromatids separate during the anaphase phase of mitosis. It's a critical juncture in cell division when replicating chromosomes split into two new identical sets. The chromatids, initially paired together at the beginning of mitosis, comply with the pull of the spindle fibers, moving each sister chromatid to opposite ends of the cell. The separation of sister chromatids ensures that each new cell formed during division will have a precise copy of the genetic material contained in the original cell.
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The following diagram shows an oceanic food web. At what trophic level do the killer whales primarily feed?
Killer whales, based on a general oceanic food web, primarily feed at the fourth trophic level. This is because they feed on secondary consumers like seals, positioning them as tertiary consumers or apex predators.
Explanation:In a food web, the trophic level refers to the position an organism occupies based on its feeding habits. Primary producers make up the first trophic level, followed by herbivores or primary consumers at the second trophic level, and carnivores or secondary consumers make up the third trophic level. If Killer Whales feed on organisms like seals, which are secondary consumers, then Killer Whales would be positioned at the fourth trophic level—also known as tertiary consumers or apex predators.
This is based on a generalized oceanic food web and may not represent every environment. Additionally, depending on the specific diet of the Killer Whale in different environments, it could occupy more than one trophic level. For example, if a Killer Whale also eats fish, it could be a secondary as well as a tertiary consumer.
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Blood cells that function to fight infection are called ________.
Answer: Neutrophils
Explanation: For example, are one of the body's main defenses against bacteria. Neutrophils kill bacteria by ingesting them
A nurse observes a few small, yellow nodules on the cervix of a client during the speculum exam. They are not painful or odorous, and a thin, clear discharge is present. The nurse recognizes that these are most indicative of what type of condition?A) Cervical eversionB) Nabothian cystsC) Columnar epitheliumD) Chlamydia infection
Answer:
B) Nabothian cysts
Explanation:
Nabothian cysts are tiny cysts filled with mucus (secreted by the cervical glands), from on the surface of cervix.
These cysts are smooth and appear white or yellow in color. They do not cause pain, discomfort, or other symptoms. But they maybe a cause for bleeding between periods, unusual clear discharge, or pelvic pain,
Sometimes these small, yellow nodules (bumps) on the cervix are valled cervical cysts , mucinous retention cysts, or epithelial cysts.
Nabothian cysts are common but they aren't a threat to health and they aren't a sign of cervical cancer.
During meiosis I, the two kinetochores of sister chromatids fuse and kinetochore microtubules from one pole of the cell attach to the fused kinetochore. This is important because it ensures that during anaphase I
Answer:
sister chromatids are pulled toward the same pole of the cell.
Explanation:
Meiosis can be defined as process where a single cell is divided twice in order to produce four cells( i.e sex cells which are; Sperm and Eggs) which contains half the original amount of genetic information.
Meiosis can be divided into nine different stages. when the cell divide for first time is referred to as *meiosis I* and the second time it divides it's referred to as meiosis II.
During Meiosis The cell divide twice to form four daughter cells, the daughter cells contains half the number of chromosomes of the parent cell( haploid).Our sex cell is produced by Meiosis.
During meiosis I, the two kinetochores of sister chromatids fuse and kinetochore microtubules from one pole of the cell attach to the fused kinetochore. This is important because it ensures that during anaphase I
05. Boarding up windows would be one emergency action most likely taken to prepare
for which natural disaster?
Answer:
The answer is Hurricane
Explanation:
Tornadoes move to quick and form to fast and you will never know when a Tsunami hits you don't know either. So therefore it is Hurricane
What type of information is encoded within genes
a gene is a sequence of nucleotides in DNA or RNA that encodes the synthesis of a gene product, either RNA or protein.
Final answer:
Genes encode information in the form of sequences of nitrogenous bases in DNA, grouped into codons in mRNA, which specify amino acids for proteins. The genome contains all hereditary information, directing cells to produce specific proteins essential for life. This genetic information is passed down through generations.
Explanation:
The information encoded within genes is essentially the blueprints for building an organism and is found in the organism's DNA. This information is stored as a sequence of nitrogenous bases represented by the letters A (adenine), C (cytosine), G (guanine), and T (thymine) in DNA, which translate to A, C, G, U (uracil) in mRNA. These sequences are grouped into sets of three called codons, and each codon specifies a particular amino acid, the building block of proteins, or signals the start or end of protein synthesis.
An organism's genome comprises all the hereditary information, which includes both the genes and non-coding sequences of DNA. Just like instructions in a manual lead to the construction of a model airplane or the knitting of a sweater, the DNA 'instructions' guide the cell in the production of proteins. The resultant proteins are critical for the cell's structure and function, with various proteins like interleukin-2 and alpha-2u-globulin serving as examples of the diversity of structures that are directed by genetic information.
Each gene on a chromosome can be seen as a section of DNA that provides the code not only for the corresponding RNA but also for the proteins required for all life processes. Thus, through the replication of DNA, genetic information is faithfully transmitted from one generation to the next, ensuring the continuity of biological traits.
Which of the following has the longest wavelength?
radio waves
infrared light
microwaves
red light
Answer:
radio waves
Explanation:
Radio waves have the longest wavelength out of all options provided due to their low frequency.
Explanation:Out of the options provided, radio waves have the longest wavelength. Wavelength is inversely proportional to frequency, which means that the lower the frequency, the longer the wavelength.
In terms of the electromagnetic spectrum, radio waves have the lowest frequency and therefore the longest wavelength. Infrared light, microwaves, and red light all have higher frequencies and thus shorter wavelengths compared to radio waves. Value wise, Radio waves can have a wavelength as large as 100 kilometers or more while the other ones have much smaller wavelengths.
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Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to detect the lack of photosystem II in these organisms would be to _____.
OPtions are not provided in the question, The complete question is:
Some photosynthetic organisms contain chloroplasts that lack photosystem II, yet are able to survive. The best way to detect the lack of photosystem II in these organisms would be
A) to determine if they have thylakoids in the chloroplasts.
B) to test for liberation of O2 in the light.
C) to test for CO2 fixation in the dark.
D) to do experiments to generate an action spectrum.
E) to test for production of either sucrose or starch.
Answer: B) Test for liberation of O2 in the light.
Explanation:
Photosystem II is the first protein complex in the light-dependent oxygen photosynthesis reactions. It is found within algae, plant and cyanobacteria thylakoid membrane.
Enzymes absorb photons of light inside the photosystem to energise electrons, which are then transferred to plastoquinol through a combination of coenzymes and cofactors to minimise plastoquinone.
A test can be perform to liberate the oxygen (O2) in the light which is trapped in thylakoid membrane, if the light is liberated it shows presence of photosystem II and if no light will liberate, it shows lack of photosytem II.
Hence, the correct option is B.
The lack of Photosystem II in photosynthetic organisms can be detected by measuring the production of oxygen during photosynthesis.
Explanation:The best way to detect the lack of Photosystem II in photosynthetic organisms is through experiments that measure the production of oxygen during photosynthesis. Photosystem II is responsible for splitting water molecules and releasing oxygen as a byproduct. Therefore, if an organism lacks Photosystem II, it will not produce oxygen during photosynthesis. One way to measure oxygen production is through the use of a dissolved oxygen probe, which can monitor the change in oxygen concentration over time.
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People have used selective breeding to improve crops and domestic animals. Modern applications of genetics and gene technology have resulted in major changes in crops and animals. List 3 examples of selective breeding in domestic animals or crops. Use one of the examples and explain how they might go about selecting for a particular trait.
Answer:
Cows that produce lots of milk,Chickens that produce large eggs,Wheat plants that produce lots of grain.
More grains being grown is helpful since it contains things that the human body needs to survive.
Explanation:
Selective breeding in crops and domestic animals has led to significant improvements in agricultural productivity. Example include breeding cows for higher milk quality, creating new dog breeds through artificial breeding, and genetically engineering crops with specific traits. Breeders can select for a particular trait by choosing individuals that already possess the trait and breeding them together.
Explanation:Selective breeding is used to improve crops and domestic animals. Three examples of selective breeding are:
Breeding cows for higher milk quality and quantityArtificially breeding dogs to create new breedsCreating transgenic crops with traits useful to humansTo select for a particular trait, breeders can choose individuals that already possess the desired trait and breed them together. This increases the chances of offspring inheriting and expressing the desired trait. Over time, continuous selection for the trait can lead to significant improvements.
What information is presented as a fact in the article? Check all that apply.
The data cannot be studied in context.
It is difficult to tell if fluoride causes this cancer.
The sources diagnosing the cancer may be unreliable.
Answer:
It is difficult to tell if fluoride causes this cancer.
Explanation:
The U.S. public health service has diverse team with more than 6500 employees. Their mission is to promote health and safety of the people of United States. The fluoride is added to drinking water since 1940s and this process is called water fluoridation. It is difficult to tell if the fluoride causes cancer but there has not been any relationship found between fluoridated water and cancer. Fluoridated water can reduce and reverse the tooth decay.
Answer: the second one
“it is difficult to tell if fluoride causes this cancer”
Explanation: On edg.2020
You and another rescuer find an unconsious adult on the floor. You send the other rescuer to summon advanced medical personnel. When you do the initial assessment, you find that the victim has a pulse, but is not moving or breathing. You should ________.
Answer:
give mouth to mouth cpr
Explanation:
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Answer:
Call advanced medical personnel and place the victim into a position that helps. Once in the position, continue to give the victim CPR until the police arrive to take care of everything else.
Explain the significance of Jacques Cousteau’s work as a filmmaker.
Final answer:
Jacques Cousteau was a pioneering filmmaker who raised awareness about marine life and conservation through his influential documentaries, such as 'The Silent World'. His work helped inspire global interest in oceanography and sustainable practices, as well as set a new standard for ethnographic filmmaking.
Explanation:
The Significance of Jacques Cousteau's Work as a Filmmaker
The late French explorer Jacques Cousteau was not only a pioneering marine conservationist but also an influential filmmaker. His films about the underwater world provided a unique and accessible look at marine biodiversity, inspiring viewers by showcasing the beauty and complexity of marine life. Through his work in film, Cousteau significantly contributed to raising awareness about the importance of preserving our oceans and the negative impacts of human activity on marine ecosystems.
One of Cousteau's most notable works is The Silent World (Le Monde du silence), which was released in 1956 and became an instant classic, allowing the audience to experience the ocean's wonders. The film depicted Cousteau's encounters with marine life, such as his dive into a chamber surrounded by Bluefin Tuna and bonito, leaving a profound impression on viewers. This type of vivid storytelling fostered a global interest in oceanography and encouraged the development of sustainable fishing practices amidst growing concerns about overfishing and the need for conservation.
Cousteau's impact on filmmaking extended beyond marine conservation. His documentaries set a new standard for ethnographic film, influencing future generations of filmmakers in how to portray environmental issues and creating a paradigm for the relationship between filmmaking, research, and education. As a result, his work has left an enduring legacy, underscoring the pivotal role of visual storytelling in environmental activism and education.