Biomolecules

Which one of the following is a peptide hormone?

1. Adrenaline
2. Glucagon
3. Testosterone
4. Thyroxine

During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process Proteins enzyme (A) Polypeptide enzyme (B) Amino acids are respectively

1. invertase and zymase
2. amylase and maltase
3. diastase and lipase
4. pepsin and trypsin

Which functional group participates in disulphide bond formation in proteins?

1. Thioester
2. Thioether
3. Thiol
4. Thiolactone

The cell membranes are mainly composed of

1. fats
2. proteins
3. phospholipids
4. carbohydrates

A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?

1. Three
2. Four
3. One
4. Two

The hormone that helps in the conversion of glucose to glycogen is

1. cortisone
2. bile acids
3. adrenaline
4. insulin

The correct statement in respect of protein haemoglobin is that it

1. functions as a catalyst for biological reactions
2. maintains blood sugar level
3. acts as an oxygen carrier in the blood
4. forms antibodies and offers resistance to diseases.

Number of chiral carbons in -D-(+)-glucose is

1. five
2. six
3. three
4. four

The helical structure of protein is stabilised by

1. dipeptide bonds
2. hydrogen bonds
3. ether bonds
4. peptide bonds

Which of the following structures represents the peptide chain?

1. [figure]
2. [figure]
3. [figure]
4. [figure]