NVCC BIO 101 EXAM 3 questions with answers

NVCC BIO 101 EXAM 3 questions with |\ |\ |\ |\ |\ |\ |\




answers

What are the 3 characteristics of DNA? - CORRECT ANSWERS
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✔✔1. Must be able to code for the sequence of amino acids in
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proteins and control protein synthesis
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2. Must be able to replicate itself prior to cell division
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3. Must be able to change over time to account for evolutionary
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change (evolution) |\




Is this statement correct? Two kinds of molecules participate in
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protein synthesis: deoxyribonucleic acid (DNA) and ribonucleic
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acid (RNA). - CORRECT ANSWERS ✔✔True
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Is this statement correct? The purines, cytosine, thymine, and
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uracil, have a single-ring structure. - CORRECT ANSWERS
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✔✔False: They are not Purines |\ |\ |\ |\




Is this statement correct? Deoxyribonucleic (DNA) acid has one
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less hydroxyl group than ribonucleic acid (RNA) - CORRECT
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ANSWERS ✔✔True |\




Is this statement correct? Each strand of DNA is oriented such
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that the 3' carbons of deoxyribose in one strand are oriented in
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, the opposite directions from the 3' carbons in the other strand,
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thus, the two strands of DNA have opposite orientations and the
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DNA molecule is said to be antiparallel. - CORRECT ANSWERS
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✔✔True


Is this statement correct? In a DNA molecule, adenine always
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bonds to thymine, and cytosine always bonds with guanine -
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CORRECT ANSWERS ✔✔True |\ |\




Is this statement correct? Thymine is not present in a DNA
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molecule. - CORRECT ANSWERS ✔✔False: It's present ONLY in
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DNA


Is this statement correct? There is a triple bond between cytosine
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and guanine and a double bond between adenine and thymine.
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Both bonds are hydrogen bonds and, coupled with hydrophobic
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forces, help the DNA molecule remain together. - CORRECT
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ANSWERS ✔✔True |\




Replication of DNA requires the existing double helix to separate
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into two template strands. This separation is accomplished by: -
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CORRECT ANSWERS ✔✔Helicase |\ |\




Where (what site) does DNA separation happen? - CORRECT
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ANSWERS ✔✔Replication Fork (Origin) of the Replication Site
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After the DNA strands have been separated ___ stabilizes the
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individual strands so that replication can continue. - CORRECT
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ANSWERS ✔✔Topoisomerase |\