"Ramachandran plot" is used to confirm the structure of:

1. RNA

2. Proteins

3. Triacylglycerides

4. DNA

All the following statements about cellulose are
correct, except

1. Cellulose is homopolymer

2. it is the most abundant organic molecule in the
biosphere

3. It is branched polymer of $\mathrm{\beta }$ -glucose

4. It has $\mathrm{\beta }$ 1-4 glycosidic bonds

Prosthetic groups differ from co-enzymes, in which:

Which of the following organic compounds is the main constituent of Lecithin?

1. Arachidonic acid

2. Phospholipid

3. Cholesterol

4. Phosphoprotein

The compound shown below:

1. is a component of ATP molecule
2. is most commonly found in ori region of DNA
3. can have enzymatic activity
4. may be a component of cell membrane

The zwitterion is shown by: 
 

1. Only A

2. Only B

3. Both A and C

4. A, B and C

The chitinous exoskeleton of arthropods is formed by the polymerisation of–
1. D- glucosamine
2. N- acetyl glucosamine
3. Lipoglycans
4. Keratin sulphate and chondroitin sulphate

Which is an essential amino acid? 
1. Serine
2. Aspartic acid
3. Glycine
4. Phenylalanine

Which element is present negligible in human body?

1. O

2. C

3. H

4. Si

Which of the following cofactor is essential for the proteolytic enzyme carboxypeptidase?

1. Zinc

2. Copper

3. Magnesium

4. Iron