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1. Which of the following activities cannot be performed by the human red

blood cell ?

A. Absorption of glucose

B. Cell division *

C. Release of energy

D. Release of oxygen

2. The table below gives descriptions of four membranous structures in a

cell. Which structure is correctly matched with its function ?

Structure FunctionA

.

A spherical sac bounded by a single

membrane

Protein synthesis

B.

A sac bounded by two membranes, theinner highly folded

Packaging proteins

C.

An extensive network of tubes and sacs;each tube and sac bounded by a singlemembrane

Lipid synthesis *

D.

A stack of elongated , curved sacs; eachsac bounded by a single membrane

photosynthesis

3. The diagram below shows a typical plant cell after being placed in a

concentrated salt solution for 10 minutes.

Diagram

Which of the numbered structures are partially permeable barriers ?

A. 1 only

B. 2 only

C. 1 and 2 only

D. 2 and 4 only *

4. The diagram below shows a plant cell (1) at the start of an experiment

and (2) after immersing the cell in a concentrated salt solution.

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Diagram

Which of the following occupies the region labeled X ?

A. Air

B. Water

C. Sugar solution

D. Salt solution

5. What is the major function of monosaccharides in animals ?

A. Acts as food reserve

B. Acts as structural material

C. Regulates metabolism

D. Releases energy *

6. Which of the following options correctly states the lock and key in

the hypothesis that explains the mode of the enzyme action ?

Lock Key

A. Sucrase Glucose and fructose

B. Sucrose Sucrase

C. Sucrase Sucrose *

D. Glucose and fructose Sucrase

7. Four flasks labeled W, X, Y, and Z were prepared. The contents of the

flasks are given below.

8. Two boiling tubes containing 5 cm3 of hydrogen peroxide solution and

1cm3

of catalase solution respectively were kept at 25o

C for 10 minutes.The contents of the two tubes were the mixed and maintained at the

same temperature, and the amount of oxygen released was recorded for

5 minutes. The results are shown in the graph below.

Diagram

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The line levels off at the 3rd minute. Which of the following is a correct

explanation for this ?

A. The reaction stops at the 3rd minute because catalase has been used

up

B. The reaction stops at the 3rd minute because hydrogen peroxide has

been used up*

C. The reaction rate reaches the maximum at the 3rd minute because

the amountof oxygen released is highest

D. The reaction rate reaches the maximum at the 3rd minute because

there is no more increase in the amount of oxygen released