The enzyme that catalyzes the synthesis of ATP in chloroplasts is:
A. Rubisco
B. PEP carboxylase
C. ATP synthase
D. NADP reductase
Answer: Option C
Solution (By JKExamLibrary)
ATP synthase (CF₀-CF₁ complex) uses the proton gradient across the thylakoid membrane to synthesize ATP. Rubisco fixes CO₂, NADP reductase reduces NADP⁺, PEP carboxylase is in C4 plants.
Explanation:
Iodine is incorporated into thyroxine (T₄) and triiodothyronine (T₃) synthesized by the thyroid gland. Deficiency leads to goiter and hypothyroidism. Iron is in hemoglobin, zinc in insulin and enzymes, cobalt in B₁₂.
Consider the following statements about the carbon cycle:
1. Photosynthesis removes CO₂ from the atmosphere.
2. Respiration and combustion return CO₂ to the atmosphere.
3. Decomposition releases CO₂.
Which of the above is/are correct?
Explanation:
Blood group O lacks A and B antigens on red cells but contains both anti-A and anti-B antibodies in plasma. This makes it the universal donor for packed red cells but dangerous plasma donor. Group AB has no antibodies. So, the presence of both antibodies is correct.
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