Biology MCQs – Page 90

✅ C. Competitive inhibitor

Option A: Irreversible inhibitor Option B: Reversible inhibitor Option C: Competitive inhibitor Option D: Non-competitive inhibitor Correct Answer : Competitive inhibitor Read more

✅ C. Inhibitor

Option A: Co-enzyme Option B: Blocker Option C: Inhibitor Option D: Cofactor Correct Answer : Inhibitor Read more

✅ B. 37?C

Option A: 27?C Option B: 37?C Option C: 47?C Option D: 30?C Correct Answer : 37?C Read more

✅ C. Denaturation of the enzyme

Option A: Change in ionization of amino acids at the active site of the enzyme Option B: Change in the ionization of the substrate Option C: Denaturation of the enzyme Option D: Increase in the reaction rate Correct Answer : Denaturation of the enzyme Read more

✅ A. 2.0 ?m

Option A: 2.0 ?m Option B: 2-4 A Option C: 24 ?m Option D: 24 A Correct Answer : 2.0 ?m Read more

✅ C. Denatured

Option A: Activate Option B: Unaffected Option C: Denatured Option D: None of these Correct Answer : Denatured Read more

✅ A. increase in concentration of enzyme

Option A: increase in concentration of enzyme Option B: increase in concentration of substrate Option C: increase in pH Option D: increase in temperature Correct Answer : increase in concentration of enzyme Read more

✅ D. Both a and b

Option A: Their physical properties like size & weight. Option B: Physical properties of the medium like its density. Option C: Their electrical properties like their charges Option D: Both a and b Correct Answer : Both a and b Read more

✅ A. Irreversible inhibitor

Option A: Irreversible inhibitor Option B: Reversible inhibitor Option C: Competitive inhibitor Option D: Non-competitive inhibitor Correct Answer : Irreversible inhibitor Read more

✅ C. Competitive inhibitor

Option A: Irreversible inhibitor Option B: Reversible inhibitor Option C: Competitive inhibitor Option D: Non-competitive inhibitor Correct Answer : Competitive inhibitor Read more

✅ B. 250000X

Option A: 500 X Option B: 250000X Option C: 500000X Option D: 250X Correct Answer : 250000X Read more

✅ A. Saturation

Option A: Saturation Option B: Denaturation Option C: Composition Option D: Inhibition Correct Answer : Saturation Read more

✅ C. Robert Brown

Option A: Lorenz Oken Option B: Schwann Option C: Robert Brown Option D: Rudolph Virchow Correct Answer : Robert Brown Read more

✅ C. Polysomes

Option A: Polymer Option B: Polypeptide Option C: Polysomes Option D: Monomer Correct Answer : Polysomes Read more

✅ B. This relation is for unlimited time period with unlimited enzyme concentration

Option A: Increase in enzyme molecule increases the available active sites. Option B: This relation is for unlimited time period with unlimited enzyme concentration Option C: If the concentration is doubled the rate will become two fol Option D: None of these. Correct Answer : This relation is for unlimited time period with unlimited enzyme concentration Read more

✅ D. It explains the mechanism of every chemical reaction

Option A: Specific enzyme can transform only a specific substrate Option B: Active site of an enzyme is a non flexible structure Option C: Active site does not change before during or even after the reaction Option D: It explains the mechanism of every chemical reaction Correct Answer : It explains the mechanism of every chemical reaction Read more

✅ C. All the active sites on enzyme molecule are occupied

Option A: Enzymes get denatured at higher substrate conc Option B: Rate of reaction is indirectly proportional to substrate concentration at this point Option C: All the active sites on enzyme molecule are occupied Option D: None of these Correct Answer : All the active sites on enzyme molecule are occupied Read more

✅ C. Determined by structure and the specificity of the enzyme

Option A: Never changes Option B: Forms no chemical bond with substrate Option C: Determined by structure and the specificity of the enzyme Option D: They are non specific in their action Correct Answer : Determined by structure and the specificity of the enzyme Read more

✅ C. Nucleolus

Option A: Cytoplasm Option B: Nucleus Option C: Nucleolus Option D: Endoplasmic reticulum Correct Answer : Nucleolus Read more

✅ C. Peroxisomes

Option A: Glyoxisomes Option B: Lysosomes Option C: Peroxisomes Option D: Ribosomes Correct Answer : Peroxisomes Read more