Biology MCQs with answers Page - 255

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A

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Q. Which enzyme is allosteric?

  • (A) Hexokinase
  • (B) Phosphofructokinase
  • (C) Pepsin
  • (D) Trypsin

A

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Q. Assertion (A): Myelinated neurons conduct impulses faster.
Reason (R): Myelin sheath allows saltatory conduction.

  • (A) Both A and R are true and R is correct
  • (B) Both A and R are true but R is not correct
  • (C) A is true but R is false
  • (D) A is false but R is true

A

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Q. Which law explains independent assortment?

  • (A) Mendel’s first law
  • (B) Mendel’s second law
  • (C) Hardy-Weinberg law
  • (D) Law of dominance

A

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Q. Assertion (A): Enzymes lower activation energy.
Reason (R): They increase reaction rate.

  • (A) Both A and R are true and R is correct
  • (B) Both A and R are true but R is not correct
  • (C) A is true but R is false
  • (D) A is false but R is true

A

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Q. Which structure prevents backflow of blood?

  • (A) Arteries
  • (B) Veins
  • (C) Valves
  • (D) Capillaries

A

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Q. Assertion (A): Genetic code is degenerate.
Reason (R): Multiple codons code for same amino acid.

  • (A) Both A and R are true and R is correct
  • (B) Both A and R are true but R is not correct
  • (C) A is true but R is false
  • (D) A is false but R is true

A

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Q. Which hormone is lipophilic?

  • (A) Insulin
  • (B) Adrenaline
  • (C) Thyroxine
  • (D) Glucagon

A

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Q. Assertion (A): Competitive inhibitors resemble substrate.
Reason (R): They bind active site of enzyme.

  • (A) Both A and R are true and R is correct
  • (B) Both A and R are true but R is not correct
  • (C) A is true but R is false
  • (D) A is false but R is true

A

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Q. Which is a greenhouse gas?

  • (A) Oxygen
  • (B) Nitrogen
  • (C) Methane
  • (D) Helium

A

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Q. Assertion (A): Transpiration creates negative pressure.
Reason (R): It pulls water upward in xylem.

  • (A) Both A and R are true and R is correct
  • (B) Both A and R are true but R is not correct
  • (C) A is true but R is false
  • (D) A is false but R is true

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