The aerobic process wherein living cells disintegrate glucose molecules releasing energy for the formation of ATP molecules is known as cellular respiration. The process involves 3 stages wherein oxygen and glucose react forming water and carbon dioxide. As a result of this process, chemical energy in such substances is diverted into life-sustaining activities and in the elimination of wastes.
1. During cellular respiration, the carbon dioxide produced is
(a) absorbed
(b) taken out
(c) stored
(d) consumed
Answer: (b)
2. Oxidative phosphorylation is the production of?
(a) NADH in respiration
(b) ATP in respiration
(c) NADPH in photosynthesis
(d) ATP in photosynthesis
Answer: (b)
3. What is the end product of glycolysis?
(a) Fructose I – phosphate
(b) Glucose I – phosphate
(c) Pyruvic acid
(d) Acetyl CoA
Answer: (c)
4. Before pyruvate enters the Krebs cycle, the connecting link between Krebs cycle and glycolysis is changed to
(a) PEP
(b) Oxaloacetate
(c) Pyruvate
(d) Acetyl CoA
Answer: (d)
5. Reduction of NADP+ to NADPH is seen in
(a) Glycolysis
(b) HMP
(c) EMP (1988)
(d) Calvin cycle
Answer: (b)
6. Pick the incorrect statement regarding Krebs cycle
(a) cycle starts with condensation of acetyl group with pyruvic acid to produce citric acid
(b) during the conversion of succinyl Co-A to succinic acid, synthesis of a molecule of GTP occurs
(c) at a point, reduction of FAD+ to FADH2. occurs
(d) the cycle has three points where reduction of NAD+ to NADH + H+ occurs
Answer: (a)
7. In the cellular respiration of one molecule of glucose, _________ of energy is conserved as 38 ATP molecules
(a) 686 Kcal
(b) 456 Kcal
(c) 654 Kcal
(d) 277 Kcal
Answer: (d)
8. Which of these yields the maximum number of ATP molecules and is the ultimate respiratory substrate
(a) Amylose
(b) Glucose
(c) Ketogenic amino acid
(d) Glycogen
Answer: (b)
9. The CH bond of food in cellular respiration is disintegrated through
(a) metabolism
(b) catalysis
(c) oxidation
(d) reduction
Answer: (c)
10. ___________ is the incomplete oxidation of glucose into pyruvic acid involving many intermediate steps
(a) Krebs cycle
(b) HMS-pathway
(c) Glycolysis
(d) TCA-pathway
Answer: (c)
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