NVCC BIO 101 EXAM 3 QUESTIONS WITH CORRECT ANSWERS

What are the 3 characteristics of DNA? - ANSWER-1. Must be able to code for the sequence of amino acids in proteins and control protein synthesis 2. Must be able to replicate itself prior to cell division 3. Must be able to change over time to account for evolutionary change (evolution) Is this statement correct? Two kinds of molecules participate in protein synthesis: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). - ANSWER-True Is this statement correct? The purines, cytosine, thymine, and uracil, have a single-ring structure. - ANSWER-False: They are not Purines Is this statement correct? Deoxyribonucleic (DNA) acid has one less hydroxyl group than ribonucleic acid (RNA) - ANSWER-True Is this statement correct? Each strand of DNA is oriented such that the 3' carbons of deoxyribose in one strand are oriented in the opposite directions from the 3' carbons in the other strand, thus, the two strands of DNA have opposite orientations and the DNA molecule is said to be antiparallel. - ANSWER-True Is this statement correct? In a DNA molecule, adenine always bonds to thymine, and cytosine always bonds with guanine - ANSWER-True Is this statement correct? Thymine is not present in a DNA molecule. - ANSWER-False: It's present ONLY in DNA Is this statement correct? There is a triple bond between cytosine and guanine and a double bond between adenine and thymine. Both bonds are hydrogen bonds and, coupled with hydrophobic forces, help the DNA molecule remain together. - ANSWER-True Replication of DNA requires the existing double helix to separate into two template strands. This separation is accomplished by: - ANSWER-Helicase Where (what site) does DNA separation happen? - ANSWER-Replication Fork (Origin) of the Replication Site After the DNA strands have been separated ___ stabilizes the individual strands so that replication can continue. - ANSWER-Topoisomerase