Tag: biology

Questions Related to biology

The enzyme which can cut molecules of DNA into segments is known as

dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

  1. DNA polymerase

  2. DNA ligase

  3. Restriction enzyme

  4. DNA gyrase

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Correct Option: C
Explanation:
Restriction enzymes are nick named as 'molecular scissors' due to their ability to cut DNA fragments. Thus, restriction enzymes are of great use in genetic engineering for restricting desired genes for incorporation
So, the correct answer is 'Restriction enzyme'

Usual method of DNA replication is

dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

  1. Semiconservative

  2. Conservative

  3. Dispersive

  4. Nonconservative

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Correct Option: A

DNA replication occurs in 5' 3' direction because 

dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

  1. DNA polymerase III can polymerise nucleotides in 5 3 direction

  2. DNA polymerase I carries out editing

  3. DNA polymerase I carries out polymerisation

  4. DNA polymerase II can link up only in 5 3 direction

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Correct Option: A

Experimental material in the study of DNA replication has been

dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

  1. Escherichia coli

  2. Neurospora crassa

  3. Pneumococcus

  4. Drosophila melanogaster

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Correct Option: A

Enzyme required for removing RNA primer during DNA replication is ______________.

dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

  1. Primase

  2. DNA polymerase I

  3. DNA polymerase III

  4. Ligase

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Correct Option: B

Which one is involved in DNA repair ?

dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

  1. Ligase

  2. Primase

  3. DNA polymerase III

  4. DNA polymerase I

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Correct Option: D

DNA replication is

dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

  1. Conservative and discontinuous

  2. Semiconservative and semidiscontinuous

  3. Semiconservative and discontinuous

  4. Conservative

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Correct Option: B

New strand formation on a DNA template can be initiated only by ________________.

dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

  1. DNA polymerase I

  2. DNA polymerase III

  3. RNA primer

  4. DNA primer

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Correct Option: C

Isotopes used in proving semi-conservative replication of DNA were

dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

  1. $^{14}N, ^{14}C$

  2. $^{14}C, ^{31}P$

  3. $^{14}N, ^{15}N$

  4. $^{14}N, ^{31}P$

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Correct Option: C

DNA replication requires

dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

  1. DNA polymerase

  2. DNA ligase

  3. RNA polymerase

  4. All the above

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Correct Option: D