What type of sugar molecule is present in DNA?

• D-3-deoxyribose

• D-ribose

• D-2-deoxyribose

• D-glucopyranose

52.

The amino acid, which is basic in nature is

• histidine

• tyrosine

• proline

• valine

A molecule of stachyose contains how many carbon atoms?

• 6

• 12

• 18

• 24

Protein is a polymer made of

• Carbohydrates

• Amino acids

• Nucleic acids

• Carboxylic acids

The letter 'D' in D-carbohydrates represents

• Dextrorotation

• Direct synthesis

• Configuration

• Mutarotation

Enzymatic reactions are given in Column I and enzymes in Column II.

Column I	Column II
A. Maltose → Glucose	i. Zymase
B. Sucrose → Glucose + Fructose	ii. Pepsin
C. Glucose → Ethyl alcohol + CO2	iii. Maltase
D. Starch → Maltose	iv. Invertase
E. Proteins → Amino acids	v. Diastase

Choose the correct matching of enzymatic reaction and enzyme that catalyses the correct reaction from the codes given below.

• A - ii; B - iv; C - v; D - iii; E - i

• A - iii; B - iv; C - i; D - v; E - ii

• A - v; B - iv; C - ii; D - i; E - iii

• A - v; B - iii; C - iv; D - ii; E - i

In double strand helix structure of DNA, heterocyclic base cytosine forms hydrogen bond with

• Adenine

• Guanine

• Purine

• Uracil

The amino acid containing mercaptan unit is 

• leucine

• glutamine

• cysteine

• lysine

Which one of the following is a non-reducing sugar?

• Maltose

• Lactose

• Sucrose

• Glucose

In DNA, the consecutive deoxynucleotides are connected by

• phosphodiester linkage

• phosphomonoester linkage

• phosphotriester linkage

• amide linkage