The ends of a polynucleotide chain are called: a. 5\'-terminal and N-terminal b.

Question

The ends of a polynucleotide chain are called:

a. 5'-terminal and N-terminal

b. ?-end and ?-end
c. 3'-end and 5'-end
d. N-terminal and C-terminal

e. 3-end and C-terminal

The two chains of the DNA double helix are held together by:

a. hydrophobic interactions
b. hydrophilic interactions
c. van der Waals interactions

d. Hydrogen bonds

e. both a and c

At a wavelength of _______, single-stranded DNA absorbs more light compared to double- stranded DNA:

a. 280 nanometers

b. 260 nanometers

c. 280 millimeters

d. 260 millimeters

e. 37oC

Which selection does NOT describe chromatids:

a. RNA
b. The two replicates of a chromosome joined at their centromeres c. Telomeres
d. Short or “p” arm
e. Long or “q” arm

Enzymes that alter the supercoiled or topological state of DNA by further supercoiling it or relaxing it are called _______. They are found in both prokaryotic and eukaryotic cells.

a. helicases
b. topoisomerases c. replicases
d. polymerases
e. suitcases

Explanation / Answer

1) The answer is d. (N TERMINAL and C terminal).At N terminal a free NH2 group is present and at C terminal free COOH group is present.

2) The answer is d.(hydrogen bonds).Two hydrogen bonds are present between Adenine and thymine and three between guanine and cytosine.

3) The answer is b(260nm).DNA and RNA absorbs light at 260 nm.Single stranded absorb more because in single stranded all the bases are free.

4) The answer is a

5) The answer is b.

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