21.
The basis for DNA fingerprinting is
A
occurrence of restriction fragment length polymorphism (RFLP)
B
phenotypic differences between individuals
C
availability of cloned DNA
D
knowledge of human karyotype
Answer :
occurrence of restriction fragment length polymorphism (RFLP)
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22.
Satellite DNA is useful tool in:
A
organ transplantation
B
sex determination
C
forensic science
D
genetic engineering
Answer :
forensic science
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23.
In operon concept , regulator gene functions as
A
repressor
B
regulator
C
inhibitor
D
all of these
Answer :
repressor
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24.
Which scientist experimentally proved that DNA is the sole genetic material in bacteriophage?
A
Jacob and Monod
B
Beadle and Tautum
C
Messelson and Stahl
D
Hershey and Chase
Answer :
Hershey and Chase
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25.
A complex of ribosomes attached to a single strand of RNA is known as
A
Polysome
B
Polymer
C
Polypeptide
D
Okazaki fragment
Answer :
Polysome
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26.
During replication of a bacterial chromosome DNA synthesis starts from a replication origin site and
A
RNA primers are involved
B
is facilitated by telomerase
C
moves in one direction of the site
D
moves in bi-directional way
Answer :
moves in bi-directional way
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27.
The eukaryotic genome differs from the prokaryotic genome because
A
genes in the former case are organized into operons
B
the DNA is complexed with histones in prokaryotes
C
repetitive sequences are present in eukaryotes
D
the DNA is circular and single stranded in prokaryotes
Answer :
repetitive sequences are present in eukaryotes
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28.
Which form of RNA has a structure resembling clover leaf?
A
rRNA
B
hn RNA
C
m RNA
D
t RNA
Answer :
t RNA
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29.
The telomeres of eukaryotic chromosomes consist of short sequences of
A
thymine rich repeats
B
cytosine rich repeats
C
adenine rich repeats
D
guanine rich repeats
Answer :
guanine rich repeats
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30.
Semi-conservative replication of DNA was first demonstrated in:
A
Escherichia coli
B
Streptococcus pneumoniae
C
Salmonella typhimurium
D
Drosophila melanogaster
Answer :
Escherichia coli
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