Dna Structure And Replication

Question: A cesium chloride will separate DNA molecules by
[A].

absorption

[B].

resorption

[C].

density

[D].

adhesion

Answer: Option C

Explanation:

No answer description available for this question.

Question: In the study of one experiment it was found that the value of Tm for DNA is = 40° C. If the cell has 20% GC at the above Tm, then what will be value of ‘Tm’ if the GC% increases to 60%?
[A].

Remains same

[B].

Increases

[C].

Decreases

[D].

Can not be compared

Answer: Option B

Explanation:

No answer description available for this question.

Question: If one cell has AT contents 40%, what will be the percentage of Guanine residue?
[A].

60%

[B].

15%

[C].

30%

[D].

Guanine residue can not be calculated

Answer: Option C

Explanation:

No answer description available for this question.

Question: Without telomerase, what would happen to the ends of chromosomes after each round of replication?
[A].

Chromosomes would become progressively shorter

[B].

Nothing would happen

[C].

Chromosomes would get longer

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: An RNA primer is synthesized by
[A].

DNA helicases

[B].

ligase

[C].

DNA topoisomerase

[D].

primase

Answer: Option D

Explanation:

No answer description available for this question.

Question: After one replication in 15N, how many bands should be observed in a cesium chloride gradient?
[A].

One

[B].

Two

[C].

Three

[D].

A smear

Answer: Option A

Explanation:

No answer description available for this question.

Question: DNA gyrase in E. coli
[A].

adds positive supercoils to chromosomal DNA

[B].

can be inhibited with antibiotics

[C].

is required only at the oriC site

[D].

performs the same function as helicase in eukaryotes

Answer: Option B

Explanation:

No answer description available for this question.

Question: An important difference between eukaryotic and prokaryotic DNA replication is
[A].

eukaryotic DNA polymerases are faster

[B].

more DNA polymerases are found in eukaryotes

[C].

multiple origins of replication in eukaryotes

[D].

RNA primers are not required in eukaryotes

Answer: Option C

Explanation:

No answer description available for this question.

Question: Messelsen and Stahl model of replication was called
[A].

conservative replication

[B].

semi-conservative replication

[C].

dispersive replication

[D].

Cri du Chat

Answer: Option B

Explanation:

No answer description available for this question.

Question: DNA replication results in
[A].

two completely new DNA molecules

[B].

two DNA molecules such that each one contains a strand of the original

[C].

one new DNA molecules 1 old molecule

[D].

one new molecule of RNA

Answer: Option B

Explanation:

No answer description available for this question.