26 NOVEMBER 2021 CURRENT AFFAIRS QUIZ

Problems in obtaining large amounts of proteins encoded by recombinant genes can often be overcome by using

expression vectors

YACS

BACS

all of these

TRUE ANSWER : ?
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The advantage of using DNA polymerases from thermophilic organisms in PCR is that

All of these

the DNA polymerases of these bacteria never make mistakes while replicating DNA

the DNA polymerases of these bacteria can withstand the high temperatures needed to denature the DNA strands

the DNA polymerases of these bacteria are much faster than those from other organisms

TRUE ANSWER : ?
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Bacterial cells protect their own DNA from degradation by restriction endonucleases by

deleting all recognition sites from the genome

having anti restriction endonucleases

not producing any restriction endonucleases

methylating the DNA at the sites that the enzyme recognizes

TRUE ANSWER : ?
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The deliberate modifications of an organism's genetic information by directly changing its nucleic acid content is a subject matter of

population genetics

microbiology

protein engineering

genetic engineering

TRUE ANSWER : ?
YOUR ANSWER : ?

Enzymes that recognize and cleave specific 4 to 8 base pair sequences of DNA are

DNA gyrase

helicases

DNA ligase

restriction endonucleases

TRUE ANSWER : ?
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Which of the following enzyme is used to covalently bond foreign DNA to a vector plasmid?

Restriction endonuclease

DNA helicase

DNA polymerase

DNA ligase

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following vector can maintain the largest fragment of foreign DNA?

YAC

Cosmid

Phage

Plasmid

TRUE ANSWER : ?
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An animal, that has gained new genetic information from the acquisition of foreign DNA, is considered as

a vector

an enzyme that links DNA molecules

a transgenic animal

a chimera

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What is the normal role of restriction endonucleases in bacterial cells?

To produce RNA primers for replication

To degrade the bacterial chromosome into small pieces during replication

All of these

To degrade invading phage DNA

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Vectors are

molecules that are able to covalently bond to and carry foreign DNA into cells

molecules that protect host cells from invasion by foreign DNA

molecules that help in replication

molecules that degrade nucleic acids

TRUE ANSWER : ?
YOUR ANSWER : ?