11.
The lac operon is an example of
A
arabinose operon
B
inducible operon
C
repressible operon
D
overlapping genes
Answer :
inducible operon
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12.
Polysome is formed by
A
several ribosomes attached to a single mRNA
B
many ribosomes attached to a strand of endoplasmic reticulum
C
a ribosome with several subunits
D
ribosomes attached to each other in a linear arrangement
Answer :
several ribosomes attached to a single mRNA
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13.
If one strand of DNA has the nitrogenous base sequence at ATCTG, what would be the complementary RNA strand sequence
A
TTAGU
B
UAGAC
C
AACTG
D
ATCGU
Answer :
UAGAC
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14.
T.O. Diener discovered a:
A
free infectious DNA
B
infectious protein
C
bacteriophage
D
free infectious RNA
Answer :
free infectious RNA
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15.
Which one of the following pairs of codons is correctly matched with their function or the signal for the particular amino acid?
A
GUU, GCU-Alanine
B
UAG, UGA-Stop
C
AUG, ACG-Start/Methionine
D
UUA, UCA-Leucine
Answer :
UAG, UGA-Stop
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16.
How many base pairs $$(bp)$$ are found in the haploid genome of humans?
A
2.9 × 109
B
4 × 108
C
7 × 109
D
3 × 109
Answer :
3 × 109
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17.
Infectious proteins are present in:
A
Gemini viruses
B
Prions
C
Viroids
D
Satellite viruses
Answer :
Prions
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18.
AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?
A
AGGUAUCGCAU
B
UGGTUTCGCAT
C
UCCAUAGCGUA
D
ACCUAUGCGAU
Answer :
AGGUAUCGCAU
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19.
What base is responsible for hot spots for spontaneous point mutations?
A
Adenine
B
5-bromouracil
C
5-methylcytosine
D
Guanine
Answer :
5-methylcytosine
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20.
During DNA replication, the strands separate by
A
DNA polymerase
B
topoisomerase
C
unwindase/Helicase
D
gyrase
Answer :
unwindase/Helicase
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