MGVCL EXAM PAPER (30-07-2021 SHIFT 3) QUIZ

Which histone(s) are associated with the linker DNA of a nucleosome?

Histone H1

Histone H3

Histones H2A and H2B

Histone H4

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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%?

Decreases

Can not be compared

Remains same

Increases

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The RNA primers used to initiate replication in E. coli

are removed by helicase + ATP

result in Okazaki fragments on leading strand

are removed by Pol I

are joined together by DNA ligase

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What is the approximate size (in kb) of the E. coli genome?

5500 kilobase

6500 kilobase

3000 kilobase

4500 kilobase

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DNA replication takes place in which direction?

Randomly

3' to 5'

Vary from organism to organism

5 'to 3'

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DNA replication results in

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

one new DNA molecules 1 old molecule

two completely new DNA molecules

one new molecule of RNA

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E.coli DNA polymerases II and III lack

partially 5' → 3' exonuclease activity

5' → 3' exonuclease activity

partially 5' → 3' endonuclease activity

5' → 3' endonuclease activity

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What bands will be observed in a cesium chloride gradient after two rounds of replication?

One light and one medium band

One medium band

One light, one medium and one heavy band

One medium and one heavy band

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How does ethidium bromide interact with DNA?

It does not interact

It intercalates between bases

It binds to phosphate

It binds to adenine

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The accepted hypothesis for DNA replication is

evolutionary theory

dispersive theory

conservative theory

semi-conservative theory

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