CIE Biology Paper-1: Specimen Questions 75 - 77 of 109

Question number: 75

MCQ▾

Question

Krebs cycle occur in?

Choices

Choice (4) Response
a.

Peroxisomes

b.

Mitochondrial matrix

c.

Endoplasmic reticulum

d.

Lysosome

Answer

b.

Explanation

It is also called the citric acid cycle or the tricarboxylic and is the “hub” of the metabolic system. It accounts for the majority of carbohydrate, fatty acid and amino acid oxidation. It also. Amphibole - acts both catabolically and anabolically

3NAD++ FAD + GDP + Pi + acetyl-CoA

3NADH + FADH + GTP + CoA + 2CO2

Question number: 76

MCQ▾

Question

Which part is pupil?

 Diagram of internal structure of eye

Diagram of internal structure of eye

shows above figure in pupil part

Choices

Choice (4) Response
a.

c

b.

a

c.

b

d.

d

Answer

c.

Explanation

The pupil is a hole present in the center of the iris of the eye that allows light to strike the retina.

Question number: 77

MCQ▾

Question

Which graph shows the effect of pH on the activity of pH?

Choices

Choice (4) Response
a.
 Graph of effect of pH on enzyme activity Choice A

Graph of effect of pH on enzyme activity Choice A

Finding correct graph related to effect of pH and enzyme activity

b.
 Graph of effect of pH on enzyme activity Choice B

Graph of effect of pH on enzyme activity Choice B

Finding correct graph related to effect of pH and enzyme activity

c.
 Graph of effect of pH on enzyme activity Choice C

Graph of effect of pH on enzyme activity Choice C

Finding correct graph related to effect of pH and enzyme activity

d.
 Graph of effect of pH on enzyme activity choice D

Graph of effect of pH on enzyme activity choice D

Finding correct graph related to effect of pH and enzyme activity

Answer

a.

Explanation

varying the pH of the enzyme solution will affect the active site as the free ions in the pH solution will change the charge of the ions in the active site.

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