Cell Biology Answers

With the help of of an example , explain the control of catalytic activity by feedback regulation .

Give the schematic account of the glycolytic pathway .

Explain the role of the hormone glucagone in the regulation of the level of glycogen in mammals .

Fill in the blanks :-

1. Linking of Two biomolecules at the expense of ATP is brought about the enzymes categorised as _________ .

2. The CFo CF₁ ATPase complex, present in __________ helps in the transport of protons.

3. _________ Are the base sequences in the eukaryotic genes that are not transcribed .

4. The cytoplasmic channels that connect the neighbouring cells in higher plants are called __________ .

5. The type of blood cell that does not contain a nucleus is __________ .

Choose the correct :-

1. A cell is lysed when placed in a (hypotonic / hypertonic) solution.

2. The polynucleotide chain which contains ribose sugar is (DNA /RNA) .

3. Surface features of the specimens can be examined in detail by (SEM / TEM) .

4. Structurally , (monosaccharides / fatty acid) can exist either as an open form or ring form in a solution .

5. Cellulose is a polymer of (glucose / galactose).

Write the appropriate word:

Question:- Enzyme - medicated transfer of a phosphate from a substrate to ADP.

Write a brief account of the following :

(1) Prophase of first meiotic division .

(2) Plant cell wall

(3) Components of of vertebrate blood and their functions.

Explain the process of intercellular recognization and cell aggregation with a suitable example .

Briefly explain the mechanism of formation of proton gradient in mitochondria .

Describe various steps involved in protein biosynthesis .