which of the following is TRUE of DNA?

Which of the following is TRUE of DNA?

A. The percentage of the purine A always equals the percentage of the purine G.
B. A phosphate group in a nucleotide is attached to the 3′ carbon in ribose. 

C. Successive nucleotides in a strand are connected by hydrogen bonds.
D. It is used by ribosomes for translation.
E. A purine always forms a complementary base pair with a pyrimidine

2. Why are primers needed for DNA replication?

A. The primers help with the proofreading function of DNA polymerase. 
B. They help with the joining of Okazaki fragments.
C. A tiny amount of RNA is needed to tell the cell where genes are located.
D. DNA polymerase can only add nucleotides to an existing chain.
E. They help direct the placement of the telomeres.

3. Which of the following forces contribute to the stability of a DNA double helix?

A. hydrophobic interactions of bases in the same strand
B. hydrogen bonding between bases in opposite strands
C. hydrophobic interactions of bases in the same strand and hydrogen bonding between bases in opposite strands
D.  ionic interactions between the positively charged component of one base and the negatively charged component of the neighboring base 
E. hydrophobic interactions of bases in the same strand, hydrogen bonding between bases in opposite strands, and ionic interactions between the positively charged component of one base and the negatively charged component of the neighboring base

4. The enzyme responsible for proofreading a growing DNA strand and for replacing mismatched nucleotides is:

A. helicase

B. DNA ligase

C. topoisomerase II

D. DNA replicase

E. DNA polymerase

 
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