IGCSE Biology Paper-1: Specimen Questions with Answers 74 - 76 of 208

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Question 74

Question

MCQ▾

Krebs cycle occur in?

Choices

Choice (4)

a.

Peroxisomes

b.

Endoplasmic reticulum

c.

Lysosome

d.

Mitochondrial matrix

Answer

d.

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 75

Question

MCQ▾

Which part is pupil?

Diagram of Internal Structure of Eye

Choices

Choice (4)

a.

b

b.

a

c.

d

d.

c

Answer

a.

Explanation

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

Question 76

Question

MCQ▾

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

Choices

Choice (4)

a.

Graph of Effect of pH on Enzyme Activity Choice A

b.

Graph of Effect of pH on Enzyme Activity Choice B

c.

Graph of Effect of pH on Enzyme Activity Choice C

d.

Graph of Effect of pH on Enzyme Activity Choice D

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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