Which of the following is not true about secondary metabolites?

(1)They have direct role in photosynthesis, respiration and reproduction

(2)They act as toxins or pigments or drugs or lectins

(3) Distribution is limited and restricted to special taxonomic group

(4) Organic compound of diverse nature

Which of the following is not a strict macromolecules?

(1)Carbohydrates

(2)Nucleic acids

(3)Proteins

(4)Lipids

The number of correct statements amongst the given statements is:

I. Amino acids are substitute methanes.

II. The R group in serine is hydroxyl-methyl.

III. Arachidonic acid has 20 carbon atoms including the carboxyl carbon.

IV. Glycerol is trihydroxypropane.

V. Lecithin is a phospholipid.

 1.  2     

 2.  3

 3.  4   

 4.  5

The following diagram shows the molecular structure of:

 1. A hexose sugar

 2. An aromatic amino acid

 3. A nitrogenous base found in RNA

 4. An important constituent of a DNA nucleotide.

NAD and NADP are consider as

1.  Apoenzyme and cofactor respectively.

2.  Coenzyme and co-factor respectively.

3.  Both as co-enzyme.

4.  Apoenzyme and holoenzyme respectively.

The K_m value of an enzyme denotes the substrate concentration at which the enzyme catalyzed reaction:

1. Reaches V_max

2. Shows a decline in the rate of reaction

3. Attains ½ V_max

4. Finally stops

Identify the given compound:

1. An amino acid

2. A purine base

3. Polysaccharide containing nitrogen

4. Prostaglandin

Inhibition of succinate dehydrogenase by malonate is an example of:

1. Non-competitive inhibition

2. Competitive inhibition

3. Antagonism

4. Synergism

I. Small organic molecules
II. Difficult to remove without denaturing the enzyme
III. Haem is an example

The above characters are of which of the following co-factors of an enzyme?

1. Metal ions

2. Prosthetic groups

3. Co-enzymes

4. Apoenzymes

Cellulose is present in

(1)cotton fibres

(2)Paper

(3)Cell wall of plants

(4)All of these