9 DECEMBER 2021 CURRENT AFFAIRS QUIZ

An enzyme that recognizes foreign DNA, and results in a cut in that DNA is called

helicase

reverse transcriptase

restriction endonuclease

transposase

TRUE ANSWER : ?
YOUR ANSWER : ?

The nicks or gaps between Okazaki fragments are eventually sealed by

polymerase

gyrase

RNA ligase

DNA ligase

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Leaderberg

L. Pauling

R. Franklin

W.H. Bragg

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the main damaging effect of UV radiation on DNA?

Dehydration

Formation of thymine dimers

Depurination

Single strand break

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of these drugs bind to DNA and cuts it, producing hydroxyl radicals?

Bleomycin

All of these

Erythromycin

Tunicamycin

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following would not contain DNA?

Yeast

Glass crystals

Bacteria

Mold

TRUE ANSWER : ?
YOUR ANSWER : ?

An important difference between eukaryotic and prokaryotic DNA replication is

eukaryotic DNA polymerases are faster

RNA primers are not required in eukaryotes

multiple origins of replication in eukaryotes

more DNA polymerases are found in eukaryotes

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Single stranded protein, DNAa

DNAa, gyrase

DNAb, gyrase

DNAb, DNA polymerase

TRUE ANSWER : ?
YOUR ANSWER : ?

What does ligase do during replication of DNA?

Joins nicks in DNA strands

Makes copies of mRNA from DNA

Synthesizes the lagging strand

Digests mRNA when it is no longer needed

TRUE ANSWER : ?
YOUR ANSWER : ?

DNA with a G-C content of 50% will melt at approximately

100 °C

60°C

90 °C

70 °C

TRUE ANSWER : ?
YOUR ANSWER : ?

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