Vitamin-B₁₂ contains

• CO

• Fe

• Zn

• Ca

Lactose sugar is formed from

• d-galactose

• d-glucose

• d-galactose and d-glucose

• d-glucose and d-fructose

Number of peptide bonds in dipeptide is

• 2

• 1

• 3

• 4

Carbohydrates are stored in human body as

• glucose

• glycogen

• starch

• fructose

Identify the statement which is not correct from the following.

(i)Carbohydrates are stored as glycogen in animals.

(ii) In glycylalanine, CO of peptide bond belongs to alanine.

(iii) Base - sugar- phosphate unit is known as nucleoside.

(iv) Obesity is due to hypothyroidism.

The correct answer is:

• i, iv

• ii, iii, iv

• i, iii, iv

• ii, iii

Proteins are hydrolysed by enzymes to give

• dihydroxy acids

• amino acids

• amines

• carboxylic acids

Observe the following statements.

I. Sucrose has glycosidic linkage.

II. Cellulose is present in both plants and animals.

III. Lactose contains D-galactose and D-glucose units.

Which of the following statements are correct?

• (I), (II) and (III)

• (I) and (II)

• (II) and (III)

• (I) and (III)

The helical structure of proteins is stabilised by

• peptide bonds

• dipeptide bond

• hydrogen bond

• van der Waal's forces

DNA contains the sugar

• Deoxyribose

• Ribose

• D-fructose

• D-glucose

Blood sugar is

• fructose

• maltose

• haemoglobin

• glucose