Adenosine is an example of

• nucleotide

• purine base

• pyrimidine base

• nucleoside

The statement that is not correct is

• Aldose or ketose sugars in alkailne medium do not isomerise

• Carbohydrates are optically active

• Pentaacetate of glucose does not react with hydroxylamine

• Lactose has glycosidc linkage between C₄ of glucose and C₁ of galactose unit.

Glycogen is

• a polymer of β-D-glucose units

• a structural polysaccharide

• structurally very much similar to amylopectin

• structurally similar to amylopectin but extensively branched

Which one of the following is an essential amino acid?

• Tyrosine

• Cysteine

• Isoleucine

• Serine

455.

Cheilosis and digestive disorder are due to the deficiency of

• thiamine

• ascorbic acid

• riboflavin

• pyridoxine

Which of the following is correct about H-bonding in DNA?

• A - T; G - C

• A - G; T - C

• G - T; A - C

• A - A; T - T

The glycosidic linkage present in sucrose is between

• C-1 of -β- glucose and C-4 of α- glucose

• C-1 of α- glucose and C-4 of β-fructose

• C-1 of α- glucose and C-4 of α- glucose

• C-1 of α- glucose and C-2 of β-fructose

Hormones are secreted by ductless glands of human body. Iodine containing hormone is

• Adrenoline

• Thyroxine

• Testosterone

• Insulin

Pick the wrong statements from the following.

• Deficiency of vitamin B6 (pyridoxume) results in convulsions.

• Sources of vitamin are yeast, milk, green vegetables and cereals.

• deficiency of vitamin D cause xerophthalmia

• Consumption of citrus fruits and green leafy vegetbles in food prevents scurvy.

In (+) glucose the number of chiral centres is :

• 4

• 6

• 0

• 5