Biochemistry Metabolism Quiz

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Questions and Answers

What is the main function of the HMP shunt in metabolism?

  • Synthesis of glucuronic acid for detoxification (correct)
  • Conversion of glucose to pyruvate
  • Degradation of glycogen into glucose
  • Production of ATP through substrate-level phosphorylation

Which of the following pathways primarily functions as a catabolic pathway?

  • Glycolysis (correct)
  • Gluconeogenesis
  • Krebs cycle (correct)
  • Glycogenesis

Which enzyme is specifically associated with substrate-level phosphorylation in the Krebs cycle?

  • Oxidative decarboxylase
  • Isocitrate synthase
  • Citrate synthase
  • Succinate thiokinase (correct)

What is the total ATP yield from the complete oxidation of one molecule of glucose aerobic pathway?

<p>36-38 ATP (A)</p> Signup and view all the answers

Which of these coenzymes is required by succinate dehydrogenase?

<p>FAD (C)</p> Signup and view all the answers

Flashcards

Anabolic pathway

A metabolic pathway that builds complex molecules from simpler ones, requiring energy input.

Catabolic pathway

A metabolic pathway that breaks down complex molecules into simpler ones, releasing energy.

Amphibolic pathway

A metabolic pathway that can be both anabolic and catabolic, participating in both synthesis and breakdown of molecules.

Glycolysis (Aerobic)

Breakdown of glucose in the presence of oxygen, yielding 6-8 ATP.

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Glycolysis (Anaerobic)

Breakdown of glucose in the absence of oxygen, yielding 2 ATP.

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Complete glucose oxidation (Aerobic)

Complete breakdown of glucose in the presence of oxygen, yielding 36-38 ATP.

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Oxidative decarboxylation of pyruvate

Breakdown of pyruvate into Acetyl CoA, yielding 6 ATP per 2 molecules.

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Krebs cycle oxidation of acetyl CoA

Breakdown of acetyl CoA, yielding 42 ATP per molecule.

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Substrate-level phosphorylation

ATP production by direct transfer of a phosphate group from an intermediate to ADP.

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HMP shunt coenzyme

NADP is the coenzyme required by the pentose phosphate pathway.

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Glycolysis key enzymes

Hexokinase, glucokinase, Phosphofructokinase, Pyruvate kinase are key players in glucose breakdown.

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Krebs cycle key enzymes

Citrate synthase, Isocitrate synthase, α-ketoglutarate DH are crucial enzymes in Krebs cycle.

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HMP shunt key enzymes

Glucose-6-phosphate DH is a key enzyme in HMP shunt.

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Glycogenesis

Pathway for glycogen synthesis.

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Glycogenolysis

Pathway for glycogen breakdown.

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Gluconeogenesis

Pathway for glucose synthesis from non-carbohydrate sources.

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