Which one of the following structural formulae of two organic compounds is correctly

identified with its related function?

1. A - triglyceride major - a source of energy

2. A - Lecithin - a component of cell membrane 

3. B - Adenine - forms nucleotides of the nucleic acids

4. Both 2. and 3.

Which one of the following pairs is wrongly matched?

Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched

with the category mentioned against it?

1. Thymine, Uracil         - Pyrimidines

2. Uracil, Cytosine         - Pyrimidines

3. Guanine, Adenine      - Purines

4. Adenine, Thymine     - Purines

A competive inhibitor of succinic dehydrogenase is

1. malonate                 

2. oxaloacetate

3. $\mathrm{\alpha }$-ketoglutarate       

4. malate

An organic substance bound to an enzyme and essential for its activity is called:

The enzyme amylase belongs to the class

Which of the following is an essential amino acid?

1. Cystine                         

2. Glycine

3. Phenylalanine                 

4. Serine

DNA has deoxyribose as the constituent sugar. The position where the sugar lacks oxygen is

1. 1

2. 2

3. 3

4. 4

The linkage that joins two adjacent nucleotides in RNA is

1. phosphate ester                 

2. phosphodiester

3. phosphate anhydride         

4. N-glycoside

Phosphodiester bond is present in

1. ATP

2. ADP

3. cAMP

4. none of these