DNA STRUCTURE AND REPLICATION QUIZ

Overwinding or overtightening of DNA during replication is caused and removed by

DNAb, DNA polymerase

DNAb, gyrase

Single stranded protein, DNAa

DNAa, gyrase

TRUE ANSWER : ?
YOUR ANSWER : ?

In sperm heads, DNA is particularly highly condensed and the histones are replaced with small basic protein called

protamines

pyrimidines

purines

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following species lack a 'classical' histone H1?

Arabidopsis thaliana

Saccharomyces cerevisiae

Xenopus laevis

Strongylocentrotus purpuratus

TRUE ANSWER : ?
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The nucleosome consists of histone

None of these

tetramer and 146 bp of DNA

hexamer and 146 bp of DNA

octamer and 146 bp of DNA

TRUE ANSWER : ?
YOUR ANSWER : ?

The packing ratio of nucleosomes is about

9

6

7

8

TRUE ANSWER : ?
YOUR ANSWER : ?

After one replication in 15N, how many bands should be observed in a cesium chloride gradient?

Two

A smear

One

Three

TRUE ANSWER : ?
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DNA polymerases I also has

5'-3' endonuclease activity

5'-3' exonuclease activity

both (a) and (b)

3'-5'exonuclease activity

TRUE ANSWER : ?
YOUR ANSWER : ?

Klenow fragment without free nucleotides exhibits

no activity

endonuclease activity

exonuclease activity

nickase activity

TRUE ANSWER : ?
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Who's X-ray work aided Watson and Crick in their discovery of the double helix?

W.H. Bragg

Leaderberg

R. Franklin

L. Pauling

TRUE ANSWER : ?
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Reverse transcriptase produces

DNA from peptides

RNA from DNA

DNA from RNA

RNA from RNA

TRUE ANSWER : ?
YOUR ANSWER : ?

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