Zoology MCQs for NEET — Practice Questions with Answers

(c) Adrenal gland produces adrenaline hormone after receiving a message from the brain under stressful situation. Adrenaline stimulates glycogenolysis in the liver of human beings.

Deficiency of vitamin B₁ causes beri-beri in which there occurs loss of appetite and vigour, weak heart beat etc.

Sucrose is a disaccharide formed by the condensation of α-D-glucopyranose (a glucose monomer) and β-D-fructofuranose (a fructose monomer). The α and β refer to the orientation of the glycosidic bond between the two monosaccharides.

Reducing sugars that exist in hemiacetal and hemiketal forms, undergo mutarotation in aqueous solution.

Among the given carbohydrates, only sucrose is a non-reducing sugar as in it the hemiacetal and hemiketal groups of glucose and fructose are linked together through O-atom and thus, not free. Due to the absence of free hemiacetal or hemiketal group, sucrose does not exhibit mutarotation.

Thyroxine, also known as T4, is a hormone produced by the thyroid gland. It contains four iodine atoms in its molecular structure, which is essential for its proper functioning in regulating metabolism and other physiological processes.

In DNA, the complementary base pairing is Adenine (A) pairs with Thymine (T), and Guanine (G) pairs with Cytosine (C). This specific pairing is known as Watson-Crick base pairing, which forms the double-helical structure of DNA.

(a) Vitamins are classified as
(i) Fat soluble vitamin : A, D, E, K
(ii) water soluble : Vitamin B complex and C
So vitamin B is water soluble.

RNA and DNA are chiral molecules due to the presence of D-sugar component (deoxyribose in DNA and ribose in RNA). The D-sugar component introduces chirality in the backbone of the nucleic acid molecules.

(c) ATP is a monomer molecule

(a) Antibodies are the proteins which protect the body against toxic substances and infections. When an antigen enter in the body cells, the antibodies present in the body destroyed the antigen.