DNA Quiz
1. DNA is a polymer of:
a. nudleosides
b. fatty acids
c. deoxyribose sugars connected by phosphodiester bonds
d. nucleotides
2. Which of the following are pyrimidines?
a. adenine and cytosine
b. adenine and guanine
c. adenine and thymine
d. cytosine and thymine
3. Which of the following are purines?
a. adenine and cytosine
b. cytosine and thymine
c. adenine and thymine
d. cytosine and guanine
4. A nucleic acid was analyzed and found to contain 32 percent A, 18 percent G, 17 percent C, and 33
percent T. The nucleic acid must be:
a. single-stranded RNA
b. single-stranded DNA
c. double-stranded RNA
d. double-stranded DNA
5. A nucleic acid was analyzed and found to contain 37 percent A, 16 percent G, 22 percent C, and 25
percent T. The nucleic acid must be:
a. single-stranded RNA
b. single-stranded DNA
c. double-stranded RNA
d. double-stranded DNA
6. For double-stranded DNA, consider the following base ratios:
1. A/G
2. C/T
3. C/G
4. (A+C)/(G+T)
5. (A+G)/(C+T)
6. (A+T)/(G+C)
Which of those ratios always equals 1?
a. 1 & 2
b. 4 & 6
c. 3, 4, & 5
d. 1, 4, & 5
7. The two polynucleotide chains in DNA are:
a. semidiscontinuous
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b. semiconservative
c. antiparallel
d. discontinuous
8. In the Meselson-Stahl experiment, which model of DNA replication was eliminated by the analysis of
DNA isolated from bacteria one replication cycle after shifting from 15N to 14N medium?
a. semiconservatice
b. conservatice
c. dispersive
d. parallel
9. In the semiconservative replication of DNA, progeny DNA molecules consist of:
a. one-half of the molecules with two parental strands and one-half of the molecules with two
new strands
b. all molecules with interspersed parental and new segments
c. all molecules with one parental and one new strand
d. all molecules with two new strands
10. In the conservative model for replication of DNA, progeny DNA molecules consist of:
a. one-half of the molecules with two parental strands and one-half of the molecules with two
new strands
b. all molecules with interspersed parental and new segments
c. all molecules with one parental and one new strand
d. all molecules with two new strands
11. What are the complementary base-pairing rules?
12. What chemical group is found at the 5' end of a polynucleotide chain?
13. What is the base sequence of the DNA strand that would be complementary to the following singlestranded DNA molecule?
5' GGATCTGATCCAGTCA 3'
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Quiz taken from
DNA quiz answer
1. D
2. D
3. B
4. D
5. B
6. C
7. C
8. B
9. C
10. A
11. The specific pairing of bases on the two polynucleotide chains of a double helix, that is, A with T, and
G with C.
12. Phosphate
13. 3' CCTAGACTAGGTCAGT 5' or, writing it in the 5'-to-3' orientation 5' TGACTGGATCAGATCC 3'
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