Which structure(s) of proteins remains(s) intact during denaturation process?

1. Both secondary and tertiary structures

2. Primary structure only

3. Secondary structure only

4. Tertiary structure only

The non-essential amino acid among the following is:

Sucrose on hydrolysis gives:

1. $\mathrm{\alpha }$-D-Glucose + $\mathrm{\beta }$-D-Glucose

2. $\mathrm{\alpha }$-D-Glucose + $\mathrm{\beta }$-D-Fructose

3. $\mathrm{\alpha }$-D-Fructose + $\mathrm{\beta }$-D-Fructose

4. $\mathrm{\beta }$-D-Glucose + $\mathrm{\alpha }$-D-Fructose

Which of the following metal ions activates many enzymes participating in the oxidation of glucose to produce ATP and with Na it is also responsible for the transmission of nerve signals:

1. Copper

2. Calcium

3. Potassium

4. Iron

Which of the following is a basic amino acid?

The reaction of concentrated sulphuric acid with carbohydrates (C₁₂H₂₂O₁₁) is an example of:
1. Dehydration
2. Oxidation
3. Reduction
4. Sulphonation

Deficiency of which vitamin causes osteomalacia ?

Which of the following statement is not true about glucose?

1. It is an aldohexose.

2. It contains five hydroxyl groups.

3. It is a reducing sugar.

4. It is an aldopentose.