Q330. Which of the following is a purine base in nucleic acids?
a) Thymine
b) Cytosine
c) Adenine
d) Uracil
a) Thymine
b) Cytosine
c) Adenine
d) Uracil
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Q331. In photosynthesis, oxygen is evolved from:
a) CO₂
b) H₂O
c) Glucose
d) NADPH
a) CO₂
b) H₂O
c) Glucose
d) NADPH
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Q332. Which protein is the major structural component of microtubules?
a) Actin
b) Myosin
c) Tubulin
d) Keratin
a) Actin
b) Myosin
c) Tubulin
d) Keratin
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Anil choudhary
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Q333. In an experiment, a cell is treated with colchicine. What will be the effect on cell division?
a) DNA replication stops
b) Spindle formation is inhibited
c) Cytokinesis is enhanced
d) Crossing over increases
a) DNA replication stops
b) Spindle formation is inhibited
c) Cytokinesis is enhanced
d) Crossing over increases
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Q334. The enzyme RuBisCO catalyzes which reaction in the Calvin cycle?
a) Reduction of 3-PGA to G3P
b) Carboxylation of RuBP
c) Regeneration of RuBP
d) Oxidation of NADPH
a) Reduction of 3-PGA to G3P
b) Carboxylation of RuBP
c) Regeneration of RuBP
d) Oxidation of NADPH
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Q335. Which method can determine protein tertiary structure in solution without crystallization?
a) X-ray crystallography
b) NMR spectroscopy
c) SDS-PAGE
d) ELISA
a) X-ray crystallography
b) NMR spectroscopy
c) SDS-PAGE
d) ELISA
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Q336. Which one of the following is NOT a product of the light reaction of photosynthesis?
a) ATP
b) NADPH
c) O₂
d) CO₂
a) ATP
b) NADPH
c) O₂
d) CO₂
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Q337. A mutation that changes an amino acid codon into a stop codon is called:
a) Missense mutation
b) Nonsense mutation
c) Silent mutation
d) Frame-shift mutation
a) Missense mutation
b) Nonsense mutation
c) Silent mutation
d) Frame-shift mutation
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Q338. During oxidative phosphorylation, ATP synthase is driven by:
a) Electron flow
b) Proton gradient across the inner mitochondrial membrane
c) ADP concentration
d) NADH oxidation
a) Electron flow
b) Proton gradient across the inner mitochondrial membrane
c) ADP concentration
d) NADH oxidation
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