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120. During transcription, if the
nucleotide sequence of the DNA strand that is
being coded is ATACG, then the nucleotide sequence in the mRNA would be
a) TCTGG b) UAUGC
c) UATGC d) TATGC
Ans:b
121. In
C3 plants, the first stable product of photosynthesis during the dark reaction is
a) Oxaloacetic acid
b) 3- phosphoglyceric acid
c) Phosphoglyceraldehyde
d) Malic acid
Ans:b
122. Extranuclear inheritance is a
consequence of presence of genes in
a) Endoplasmic reticulum and mitochondria
b) Ribosomes and chloroplast
c) Lysosomes and ribosomes
d) Mitochondria and chloroplasts
Ans:d
123. Which one of the following hormones is
a modified aminoacid
a) Progesterone b) Prostaglandin
c) Estrogen d) Epinephrine
Ans:d
124. Viruses that infect bacteria, multiply
and cause their lysis, are called
a) Lipolytic b) Lytic
c) Lysogenic d) Lysozymes
Ans:b
125. The recessive genes located on
X-chromosome in humans are always
a) Sub-lethal
b) Expressed in males
c) Expressed in females
d) Lethal
Ans:b
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126. The maximum growth rate occurs in
a) Senescent phase
b) Lag phase
c) Exponential phase
d) Stationary phase
Ans:c
127. Restriction endonucleases
a) Are used in genetic engineering
for ligating two DNA molecules
b) Are used for in vitro DNA synthesis
c) Are synthesized by bacteria as part of
their defense mechanism
d) Are present in mammalian cells
for degradation of DNA when the cell dies
Ans:c
128. In the resting state of the neural
membrane, diffusion due to concentration gradients,
if allowed, would drive
a) K+ and
Na+ out of the cell
b) Na+ into the cell
c) Na+ out of the cell
d) K+ into the cell
Ans:b
129. Crossing over that results in
genetic recombination in higher organisms occurs between
a) Non-sister chromatids of a bivalent
b) Two daughter nuclei
c) Two different bivalents
d) Sister chromatids of a bivalent
Ans:a
130. Which of the following statements is not
true for retroviruses
a) Retroviruses carry gene for
RNA- dependent DNA polymerase
b) The genetic material in
mature retroviruses is RNA
c) Retroviruses are causative agents
for certain kinds of cancer in man
d) DNA is not present at any stage in the
life cycle of retroviruses
Ans:d
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