IGCSE Biology Paper-2: Specimen Questions with Answers 25 - 27 of 103

Question number: 25

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Question

What is not a characteristic of an enzyme?

Choices

Choice (4) Response

a.

Enzymes are proteins

b.

Enzymes cannot be coagulated by alcohol

c.

Enzymes have an optimum pH range within which the enzymes function is at its peak.

d.

Enzymes show varying degree of specificities.

Answer

b.

Explanation

Enzymes have great catalytic power and like the proteins, alcohol, heat, concentrated acids and alkaline reagents can coagulate enzymes.

Question number: 26

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Question

Figure shows a structure of human eye. Which part is cornea?

The figure shows a structure of human eye

The Figure Shows a Structure of Human Eye

Figure shows different parts of human eye and in this picture identify the part cornea from given parts A, B, C, D

Choices

Choice (4) Response

a.

Part D

b.

Part C

c.

Part B

d.

Part A

Answer

d.

Explanation

The cornea is the transparent front portion of the eye that protects the iris, pupil, and anterior chamber of eye. Cornea is a highly organized group of cells and proteins.

Question number: 27

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Question

The diagram shows a structure of heart. Which part is pulmonary artery

Image is related to structure of human heart

Image is Related to Structure of Human Heart

Image shows different parts of the heart of human being

Choices

Choice (4) Response

a.

Part A

b.

Part B

c.

Part C

d.

Part D

Answer

c.

Explanation

The pulmonary artery is the part of heart, which carries deoxygenated blood from the heart to the lungs.