(A) Khorana
(B) Watson
(C) Crick
(D) Arber
Tag: Microbiology Mcqs
Restriction endonucleases, when present in a host cell act on foreign DNA molecule and cleave them, but they do not act on host DNA molecule. It happens because:
(A) Restriction endonuclease cannot act on host DNA
(B) Host DNA is packed into chromosom
(C) Host DNA is methylated hence restriction endonucleases can’t act.
(D) Restriction endonucleases become inactive when they reach host DNA
Transgenic organisms are:
(A) Produced by gene transfer technology
(B) Extinct organisms
(C) Naturally occurring and endemic
(D) Produced by traditional plant breeding technique
Which one of the following statements about plasmids is correct?
(A) Plasmids are mobile.
(B) Plasmids are made up of RNA and proteins.
(C) Plasmids are present in eukaryotes.
(D) Plasmids are present in fungi.
Which one of the following statements about Restriction Endonuclease (RE) is TRUE?
(A) All “RE” cut DNA at specific sites
(B) All “RE” cut DNA at random sites
(C) All “RE” join DNA segments at specific sites
(D) All “RE” join DNA at random sites
DNA finger printing was first developed by:
(A) David Suzuki
(B) Khorana
(C) Alec Jaffreys
(D) Gilbert
Which one of the following statement are NOT attributed to plasmids?
(A) They are circular DNA molecule
(B) They have antibiotic resistant genes
(C) They have the ability of autonomous replication
(D) They have DNA that is as long as chromosomal DNA
__is autonomously replicating minichromosome.
(A) Virus
(B) Phage
(C) Plasmid
(D) Lichen