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Biochemistry Question Paper

Biochemistry

Course: Bachelor Of Medical Laboratory Sciences

Institution: Kenya Methodist University question papers

Exam Year:2012

Kenya Methodist University
Faculty of Health Sciences
Department of Medical Laboratory Sciences and Department of Nursing
Unit Code: BIOC 201
Unit Name: BIOCHEMISTRY
QUESTIONS
1. Compare and contrast proteins and nucleic acids. Consider both their structures and their
functions. (7 Marks)
2. In humans, blood pH is maintained fairly precisely around 7.4, and this is largely
accomplished with the help of bicarbonate ion (HCO3
-) and carbonic acid (H2CO3), both
of which are floating around in the blood. If blood suddenly becomes acidic for some
reason, bicarbonate turns into H2CO3. If blood suddenly becomes too basic, some H2CO3
turns into HCO3
-. Using your knowledge of acids, bases, and buffers, explain how pH is
maintained at a constant level in this system. (5 Marks)
3. Why are fats and waxes solid at room temperature, whereas oils are liquids?
i. With your answer to that question in mind, how do you think the phospholipids of
coldwater fish compare to warm water fish? (2 Marks)
ii. Would you expect to see differences in the amounts of saturated and unsaturated
fatty acids? (3 Marks)
4. Find out how much cellulose is made by all the plants in the biosphere and compare it
with how much of paper is manufactured by man and hence what is the consumption of
plant material by man annually? (3 Marks)
5. a) The two strands in DNA are not identical but are complementary. Explain.
(2 Marks)
b) Explain the amphoteric behaviour of amino acids (3 Marks)
6. During the winter, many species of amphibians and reptiles go into a hibernation-like
state called overwintering. They eat little or no food, slow their metabolism and breathing
rate dramatically, and most of their bodily functions shut down. Interestingly, many of
these species choose to spend the winter underwater. Explain why might it be
advantageous to overwinter at the bottom of a pond rather than on land (5 Marks)

Biochemistry Question Paper

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