Biochemistry MCQs

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Oil staining from cooked meat can be washed with biolgical washing powder. Which combination of enzymes should be in the washing powder to remove the stain?

  • A. amylase and lipase
  • B. protease and lipase
  • C. amylase and pectinase
  • D. protease and pectinase
  • Correct Answer: Option B

Respiration involves the action of _______________________ in cells

  • A. Cytoplasm
  • B. Ribosomes
  • C. DNA
  • D. Enzymes
  • Correct Answer: Option D

An oxygen debt is the build up of

  • A. carbon dioxide
  • B. oxygen
  • C. lactic acid
  • D. urea
  • Correct Answer: Option C

What are the products of anaerobic respiration in muscles?

  • A. ethanol and carbon dioxide
  • B. ethanol only
  • C. lactic acid and carbon dioxide
  • D. lactic acid only
  • Correct Answer: Option D

Why is yeast used in bread-making?

  • A. to provide carbon dioxide
  • B. to provide ethanol
  • C. to provide lactic acid
  • D. to provide oxygen
  • Correct Answer: Option A

Glucose is required for respiration. Which other molecule is required for aerobic respiration?

  • A. carbon dioxide
  • B. nitrogen
  • C. oxygen
  • D. water
  • Correct Answer: Option C

Vigorous exercise can cause an oxygen debt. Which process removes the oxygen debt?

  • A. aerobic respiration of lactic acid in the liver
  • B. a decrease in breathing depth
  • C. a decrease in heart rate
  • D. an increase in blood supply to the small intestine
  • Correct Answer: Option A

What is the equation for aerobic respiration in plants?

  • A. C6H12O6 6O2 → 6CO2 6H2O
  • B. C6H12O6 → 2C3H6O3
  • C. 6CO2 6H2O → C6H12O6 6O2
  • D. C6H12O6 → 2C2H5OH 2CO2
  • Correct Answer: Option A

Four freshly cut potato cylinders were soaked for one hour in different salt solutions. Which salt solution would cause the potato cylinder to be most flaccid?

  • A. 0.1 mol per dm3
  • B. 0.3 mol per dm3
  • C. 0.7 mol per dm3
  • D. 1.0 mol per dm3 s
  • Correct Answer: Option D

Yeast is able to respire both aerobically and anaerobically.

  • A. Aerobic respiration produces alcohol as one of its waste products.
  • B. Aerobic respiration produces three times as much carbon dioxide as anaerobic respiration from one molecule of glucose.
  • C. Anaerobic respiration and aerobic respiration both produce the same amount of carbon dioxide from one molecule of glucose.
  • D. Anaerobic respiration produces three times as much carbon dioxide as aerobic respiration from one molecule of glucose.
  • Correct Answer: Option B