Which of the following is a basic amino acid?

1.	Tyrosine	2.	Phenylalanine
3.	Lysine	4.	Tryptophan

Given below is diagrammatic representation of small molecular weight organic compounds in living tissues

Choose the option which is correct identification of structures labelled as 1, 2 and 3

         1                                                 2                                            3

1. Nucleoside                                      Nucleotide                              Adenine

2. Nucleotide                                      Nucleoside                              Guanine

3. Nucleoside                                      Nucleotide                              Guanine

4. Nucleotide                                      Nucleoside                              Adenine     

Amino acids differ from each other mainly at R group. If R group of proteinaceous amino acid is hydroxy methyl, the amino acid would be

1. Glycine

2. Alanine

3. Serine

4. Tyrosine

Match Column I with Column II and mark the correct option:

1. a(3), b(4), c(1), d(2)
2. a(4), b(1), c(3), d(2)
3. a(4), b(2), c(1), d(2)
4. a(2), b(1), c(3), d(4) 

Select the set of secondary metabolites

Which of the following biomolecule is not a biomacromolecule but present in the acid-insoluble fraction 

1. Protein

2. Lipid

3. Nucleic acid 

4. Polysaccharide

Which of the following set of molecule show presence of heterocyclic ring?

The inhibition of succinic dehydrogenase by malonate is an example of

1. Non-competitive inhibition

2. Competitive inhibition 

3. Allosteric modulation

4. All of these

The chemical formula ${\mathrm{C}}_{20}{\mathrm{H}}_{32}{\mathrm{O}}_2$ can be of:
1. Palmitic acid
2. Arachidonic acid
3. Cholesterol
4. Lecithin

A linear sequence of amino acids in a peptide or a protein describes its: