• DNA is a polymer of:A. NucleosidesB. fatty acidsC. deoxyribose sugars connected by covalent bondsD. nucleotides

Which of the following are pyrimidines?

A. adenine and cytosineB. adenine and guanineC. adenine and thymineD. cytosine and guanineE. cytosine and thymine

Which of the following are purines?

A. adenine and cytosineB. adenine and guanineC. adenine and thymineD. cytosine and guanineE. cytosine and thymine

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 RNAB. single-stranded DNAC. double-stranded RNAD. double-stranded DNA

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 RNAB. single-stranded DNAC. double-stranded RNAD. double-stranded DNA

The two polynucleotide chains in DNA are:

A. SemidiscontinuousB. SemiconservativeC. ParallelD. DiscontinuousE. antiparallel

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

• What are the complementary base-pairing rules?

• What chemical group is found at the 5' end of a polynucleotide chain?

• What is the base sequence of the DNA strand that would be complementary to the following single-stranded DNA molecule?5' GGATCTGATCCAGTCA 3‘

• The percent of cytosine in a double-stranded DNA is 21. What is the percent of thymine in that DNA?

• The percent of adenine in a double-stranded DNA is 38. What is the percent of cytosine in that DNA?

• The percent of guanine in a double-stranded DNA is 14. What is the percent of adenine in that DNA?

• Describe the replication of the leading strand (briefly)

• Describe the replication of the lagging strand (briefly)

• State the main purpose of DNA replication

Challenge Questions:

• DNA from a virus contains 19 percent A, 29 percent T, 25 percent G, and 27 percent C. Interpret these data.

• Research shows that there is generally one error in every 100 million cell division in a given gene. What are the consequences of the error? How is the error corrected?