Biology Chapter 2 Entry test MCQs
51. The oxidation of succinate produces:
a. Malate
b. NADH
c. ATP
d. FADH2
52. Both NADH and FADH2 are formed during:
a. Krebs cycle
b. A. Glycolysis
c. Fermentation
d. The electron transport system
53. When products of glycolysis pass through Krebs cycle, it will produce:
a. 1 NADH, 3 FADH2, 2 ATP
b. 2 NADH, 2 FADH2, 2 ATP
c. 6 NADH, 2 FADH2, 2 ATP
d. 1 NADH, 1 FADH2, 1 ATP
54. The precursor of fumarate during Krebs cycle require…………….for fumarate synthesis.
a. Succinate dehydrogenase
b. Succinate
c. FAD Oxidase
d. Fumarate dehydrogenase
55. Before pyruvate enters the citric acid cycle, it is decarboxylated, oxidized and combined with coenzyme A, forming acetyl CoA, carbon dioxide and one molecule of:
a. ATP
b. NADH
c. ADP
d. FADH2
56. Starting from end products of glycolysis, how many molecules of CO2 are produced up to the formation of succinate in a single Krebs cycle?
a. 6
b. 2
c. 3
d. 12
57. Which of the following process is used in the conversion of pyruvate to acetyl CoA?
a. Decarboxylation
b. Dehydration
c. Dehydrogenation
d. Both A and C
58. Biological oxidation involves removal of hydrogen, linked with specific coenzymes and is catalyzed by:
a. Dehydrogenase
b. Carboxylase
c. Catalase
d. Hydrogenase
59. Phosphorylation of ADP during glycolysis occurs via:
a. Chemiosmosis
b. Photophosphorylation
c. Substrate level phosphorylation
d. Oxidative phosphorylation
60. Before entering Krebs cycle, the pyruvate decarboxylated into:
a. Citric acid
b. Alpha-ketogluteric acid
c. Acetaldehyde
d. Glyceric acid
E.T.C, Chemiosmosis and Oxidative Phosphorylation
61. During respiratory chain of cellular respiration, cytochrome c oxidizes:
a. Cytochrome a3
b. Cytochrome a
c. Cytochrome a complex
d. Cytochrome b
62. Which of the following is the final acceptor of electron in respiratory chain?
a. Oxygen
b. Cytochrome a
c. Hydrogen
d. Cytochrome a3
63. Electron transport chain in mitochondria is used to:
a. Create electron gradient
b. Synthesize NADP+
c. Create proton gradient
d. Synthesize ADP
64. Which of the following types of mammalian cell does not carry out oxidative phosphorylation?
a. Oxyntic cell
b. Erythrocytes
c. Cardiac muscle cell
d. Neuron
65. The stage of cellular respiration producing maximum ATP:
a. Krebs cycle
b. Glycolysis
c. Chemiosmosis
d. Oxidation of pyruvate
66. ATP formation through oxidative phosphorylation involves:
a. Chemiosmosis
b. Light reactions
c. Fermentation
d. Dark reactions
Regulation of Cellular Respiration
67. Phosphofructokinase is inhibited by:
a. High concentration of ATP
b. High concentration of NADH
c. Pyruvate decarboxylase
d. Low concentration of citrate
68. High concentration of NADH inhibits:
a. Glucokinase
b. Pyruvate decarboxylase
c. Pyruvate kinase
d. Phosphofructokinase
Importance of G3P
69. A aldo sugar that is intermediate between respiration and photosynthesis:
a. Glyceraldehyde 3-phosphate
b. Glucose
c. Fructose
d. Dihydroxyacetone
70. G3P is converted into glucose phosphate in:
a. Golgi apparatus
b. Mitochondria
c. Endoplasmic reticulum
d. Chloroplast
Cellular Respiration of Fats and Proteins
71. An 18 carbon fatty acid is converted into how many acetyl-CoA molecules?
a. 9
b. 18
c. 18
d. 16
72. Deamination of amino acid takes place in:
a. Pancreas
b. Liver
c. Gall bladder
d. Kidney