Restriction endonucleases are enzymes which
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(a) make cuts at specific positions within the DNA molecule (b) recognize a specific nucleotide sequence for binding of DNA ligase (c) restrict the action of the […]
Select the correct statement from the following?
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(a) Biogas is produced by the activity of aerobic bacteria on animal waste (b) Methanobacterium is an aerobic bacterium found in rumen of cattle (c) […]
In genetic engineering, the antibiotics are used
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(a) as selectable markers (b) to select healthy vectors (c) to keep the cultures free of infection (d) as sequences from where replication starts
Correct […]
Which one is a true statement regarding DNA polymerase used in PCR
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(a) It is used to ligate introduced DNA in recipient cell (b) It serves as a selectable marker (c) It […]
Which one of the following represents a palindromic sequence in DNA?
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(a) 5′ – GAATTC – 3′ 3′ – CTTAAG – 5′ (b) 5′ – CCAATG – 3′ 3′ – GAATCC – […]
Which one of the following palindromic base sequences in DNA can be easily cut at about the middle by some particular restriction enzyme?
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(a) 5’…..CGTTCG…..3′ 3’…..ATGGTA…..5′ (b) 5’…..GATATG…..3′ 3’…..CTACTA…..5′ (c) 5’…..GAATTC…..3′ 3’…..CTTAAG…..5′ […]
The colonies of recombinant bacteria appear white in contrast to blue colonies of non-recombinant bateria because of :
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(a) Insertional inactivate of alphaga-lactosidase in non-recombinant bacteria (b) Insertional inactivation of alpha-galactosidase in […]
Bacillus thuringiensis forms protein crystals which contain insecticidal protein.
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(a) binds with epithelial cells of midgut of the insect pest ultimately killing it (b) is coded by several genes including the gene […]
RNA interference involves
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(a) Synthesis of mRNA from DNA (b) Synthesis of cDNA from RNA using reverse transcriptase (c) Silencing of specific mRNA due to complementary RNA (d) Interference of RNA in […]
What is true about Bt toxin?
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(a) Bt protein exists as active toxin in the Bacillus (b) The activated toxin enters the ovaries of the pest to sterilise it and thus prevent […]
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