Biology MCQ - Biology Notes Online

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61 Which terms describe two atoms when they form a bond in which electrons are completely transferred?

A: Proton and electron

B: Ionic and covalent

C: Polar and nonpolar

D: Anion and cation

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62 Which term describes the degree to which an element attracts electrons?

A: Redation

B: Electronegativity

C: Polarity

D: Oxidation.

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63 Which complex in the ETC is responsible for transferring electrons to oxygen?

A: Complex I

B: Complex II

C: Complex III

D: Complex IV

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64 In the malate shuttle, reducing equivalents from NADH are accepted by which compound in the cytoplasm?

A: Aspartate

B: Malate

C: Dihydroxyacetone phosphate

D: Oxaloacetate

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65 Which of the following is NOT a function of uncouplers?

A: Generating heat

B: Inhibiting ATP synthesis

C: Increasing proton gradient

D: Allowing oxidation without phosphorylation

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66 What is the role of the F1 component in the mitochondria?

A: To form a proton channel

B: To synthesize ATP

C: To transport NADH

D: To transfer electrons

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67 How many ATP can be generated from one molecule of NADH in the ETC?

A: 1 ATP

B: 2 ATP

C: 3 ATP

D: 4 ATP

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68 Which of the following compounds is known to block Complex IV in the ETC?

A: Oligomycin

B: Cyanide

C: Malonate

D: Rotenone

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69 What is the primary function of the electron transport chain?

A: To synthesize glucose

B: To generate ATP

C: To transport electrons and pump protons

D: To produce NADH

Biochemistry MCQ
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70 Which complex in the ETC is known as succinyl-CoQ reductase?

A: Complex I

B: Complex II

C: Complex III

D: Complex IV

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