During the process of digestion, the proteins present in food materials are hydrolysed to amino acids.

Proteins $\stackrel{\mathrm{Enzyme} \left(\mathrm{A}\right)}{\to } \mathrm{Polypeptides} \stackrel{\mathrm{Enzyme}\left(\mathrm{B}\right)}{\to } \mathrm{Amino} \mathrm{acids}$

The two enzymes A and B involved in the process are respectively

• amylase and maltase

• diastase and lipase

• pepsin and trypsin

• Invertase and zymase

412.

In a reversible reaction a catalyst will affect the rate of

• forward reaction

• forward and reverse reaction

• reverse reaction

• Neither (a) nor (b)

Which of the following statement is false?

• Chlorophyll is responsible for the synthesis of carbohydrate in plants.

• In presence of oxygen, haemoglobin forms oxyhaemoglobin.

• Acetyl salicylic acid is known as aspirin.

• Vitamin B₁₂ contains Mg²⁺ ion.

A sugar that is not a disaccharide among the following is

• galactose

• lactose

• maltose

• sucrose

The bonds in protein structure that are not broken on denaturation are

• hydrogen bond

• peptide bond

• disulphide bond

• ionic bond

Sucrose and glucose can be distinguished by the

• Molisch's reagents

• Baeyer's reagents

• Fehling's solution

• iodine solution

Hetrocyclic amino acid among these compound is

• lysine

• tyrosine

• proline

• serine

Purine derivative among the following bases is

• cytosine

• guanine

• uracil

• thymine

In a reversible reaction a catalyst will affect

• the rate of forward reaction and reverse reaction

• neither the forward reaction nor the rate ofreverse reaction

• the rate of forward reaction

• the rate of reverse reaction

The process by which synthesis of protein takes place based on the genetic information present in m-RNA is called

• translation

• transcription

• replication

• messenger hypothesis