Answer:
The two main DNA lesions formed by exposure to UVB are cyclobutane pyrimidine dimers (CPD) and 6-4 pyrimidine pyrimidone photoproducts (6-4PPs), and its Dewar isomers.
The answer to the given question (though the question isn't given), I can assume this is the same as a previous one as the answer is C.
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Lakes that have been acidified cannot support the same variety of life as healthy lakes. As a lake becomes more acidic, crayfish and clam populations are the first to disappear, then various types of fish. Many types of plankton-minute organisms that form the basis of the lake's food chain-are also affected. As fish stocks dwindle, so do populations of loons and other water birds that feed on them. The lakes, however, do not become totally dead. Some life forms actually benefit from the increased acidity. Lake-bottom plants and mosses, for instance, thrive in acid lakes. So do blackfly larvae.
The base pairing rules<span> for </span>DNA<span> are governed by the complementary </span>base pairs<span>: adenine (A) with thymine (T) in an A-T </span>pairing<span> and cytosine (C) with guanine (G) in a C-G </span>pairing<span>. Conversely, thymine only binds with adenine in a T-A </span>pairing<span> and guanine only binds with cytosine in a G-C </span>pairing<span>.</span>
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Medications can be tested on cell cultures instead of being injected into patients unnecessarily.
Cancer cells continue to grow in the cultures uncontrollably allowing scientists to test multiple medications on the cancer cells.
