Uracil & Thymine
Explanation:
Uracil, a nucleic acid nitrogenous base, is only found in RNA and does not occur in DNA. On DNA its place is taken by Thymine base. Marking Uracil with a radioactive or fluorescent tag will ensure that only RNA is traced while tagging Thymine ensures that only DNA is traced.
Thymine is found in DNA because it is more stable than Uracil hence it provides an evolutionary advantage in its use to store cell information.
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The answer is Neogene
Explanation:
It cannot be Cenozoic because that is an era. Not a period. Paleogene, Neogene, and Quaternary (our current period) are all periods within the Cenozoic Era (our current era). On the geologic time scale, there are Eras, Periods, and Epochs (and a few more classifications). Humans first appeared in the Miocene epoch which is an epoch in the Neogene period (in the Cenozoic era).
This is why the answer is Neogene.
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Answer: The correct answer is choice D.
Explanation: We can see on the cladogram that these two are in the same branch and lead to the same common ancestor. These two happen to share the most recent common ancestor, however.
A Scanning Electron Microscope (SEM) should be used by Sherman to try to see the 3-dimensional shape of a virus in the patient's sample.
SEM is a type of electron microscopy that can scan the surface of the object to be viewed with the help of the beam of electrons and can give clear and detailed structure of that object. It produces the image in 3-dimension.
