1. Live cells can be imaged by (a) Light microscopy (b) Electron microscopy (c)

Question

1. Live cells can be imaged by

(a) Light microscopy

(b) Electron microscopy

(c) Both kinds of microscopy

(d) With the naked eye.

2. A carbon atom has a valency of

(a) 2

(b) 3

(c) 4 or

(4) 5

3. A covalent bond between C, H and O atoms can be broken by

(a) Visible light

(b) Ultra-violet light

(c) Infra red light

(d) All of the above.

4. Water is a very good solvent for

(a) Salts

(b) Fats

(c) Carbohydrates

(d) Salts and some carbohydrates.

5. Denaturation of nucleic acids refers to

(a) Separation of complementary strands

(b) Dissociation of complementary regions of the same strand

(c) Either of the above

(d) Degradation of the molecule.

6. The structure of 4 different amino acids is shown below.

a. What kind of polymers do these compounds form and what is the type of bond and the reaction that produces them.

b. Indicate the amino acid(s) that can form

1. a disulphide bond

2. undergoes phosphorylation

3. is likely to be present in the interior of the polymer.

7. Label the a-helices and b-pleated sheets in the drawing. How are these structures produced and how can they be destroyed?

8. This drawing shows a schematic cross-section of a cellular structure. What structure is it? What are its molecular components and what functions do they perform.

9. What are the reactions shown below? What is the nature of the free energy change in each case and how does that determine the spontaneity of the reaction? How does the reaction which is normally not spontaneous occur in real life?

Explanation / Answer

1.a] Light microscopy

2. c] 4

3.d) All of the above.

4.a) salt

5.d) Degradation of the molecule.

note -only 5 questions i can answerd

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