DNA Structure and Replication – Section 1

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6. Taylor, Woods and Hughes labeled Vicia DNA by allowing new DNA synthesis in the presence of radioactive thymine. After DNA replication (S phase of the cell cycle), it was observed that

A. only one chromatid of a chromosome was labeled
B. both chromatids of a chromosome were labeled
C. both (a) and (b)
D. neither chromatid was labeled

Correct Answer: B. both chromatids of a chromosome were labeled

7. In DNA double helix, the two DNA chains are held together by

A. covalent bonds between the pair of bases
B. hydrogen bonds between the pair of bases
C. ionic bonds between the pair of bases
D. none of the above

Correct Answer: B. hydrogen bonds between the pair of bases

8. The 5′ and 3′ numbers are related to the

A. length of the DNA strand
B. carbon number in sugar
C. the number of phosphates
D. the base pair rule

Correct Answer: B. carbon number in sugar

9. Messelsen and Stahl model of replication was called

A. conservative replication
B. semi-conservative replication
C. dispersive replication
D. Cri du Chat

Correct Answer: B. semi-conservative replication

10. The most common liquid volumes in molecular biology are measured in

A. ml
B. μl
C. nl
D. 1

Correct Answer: B. μl
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