Practice 1 MCQ Questions

1. A type of mammalian red blood cell is found to contain cytoplasm that is isotonic to 1% salt solution. If these red blood cells were immersed in 0.5% salt solution they would
A. lose water by osmosis and shrink.
B. lose water by active transport and shrink.
C. gain water by osmosis and burst.
D. gain water by active transport and burst.

2. Which is the storage form of carbohydrates found in man?
A. fats
B. glycogen
C. starch
D. cellulose

3. If only green light reached the earth, which of the following is most likely to happen?
A. There would be more green plants on earth.
B. There would be more oxygen in the atmosphere.
C. There would be less carbon dioxide in the atmosphere.
D. The plants would grow slower.

4. Which of these may be heterozygous?
A. a cell which is haploid
B. an allele of a gene
C. an organism with a dominant phenotype
D. an organism with a recessive genotype

Questions 5, 6 and 7 refer to the following diagram representing four test tubes set up to investigate the effect of bile salts and the effect of boiling on the activity of lipase. 5 drops of an alkaline solution is added to each tube and each tube is shaken well at the start of the experiment.

5. Given that the pH indicator used is phenolpthalein, what observation is expected if there is activity of lipase in the tube?
A. The appearance of a pink colouration.
B. The disappearance of a pink colouration.
C. The appearance of a yellow colouration.
D. The disappearance of a yellow colouration.

6. Which tube acts as the control for the investigation into the effect of bile salts on the activity of lipase?
A. 1
B. 2
C. 3
D. 4

7. A conclusion about the effect of boiling on the activity of lipase can be drawn by comparing the results from tubes
A. 1 and 3
B. 1 and 4
C. 2 and 3
D. 3 and 4

Questions 8-12 refer to the following diagram of the human life cycle.

8. The number of autosomes present in a normal egg mother cell would be
A. 22
B. 23
C. 44
D. 46

9. The sex chromosomes present in a normal sperm mother cell would be
A. one X and one Y
B. two X
C. two Y
D. Two X and two Y

10. The process of meiosis is indicated by number
A. 1
B. 2
C. 3
D. 4

11. The process of fertilization is indicated by number
A. 1
B. 2
C. 3
D. 4

12. Haploid cells are formed as a result of process
A. 1
B. 2
C. 3
D. 4

Question 13 and 14 refer to the diagram below which shows a small part of DNA molecule during the process of replication.

DNA replication is a process which results in the formation of a duplicate, or more, copies of the parent DNA molecule (represented by A & B). During this process, the complimentary bases of the original double strands dissociate to allow for the new strands (represented by C & D) to be formed.

13. The correct identity of base I in the diagram is
A. cytosine
B. guanine
C. thymine
D. adenine

14. Adenine is the correct identity of the bases numbered
A. 2 and 3
B. 2 and 5
C. 3 and 5
D. 3 and 6