Chemical Coordination and Integration — Page 8 | NEET Biology

Q71

Insulin is

A vitamin

B lipid

C hormone

D enzyme

Correct Answer

Option C

Solution

(c) Insulin is a hormone secreted by the beta-cells of pancreas and controls the sugar level in blood.

Q72

Gastric secretion is stopped by hormone

A enterogastrone

B gastrin

C pancreozymin

D cholecystokinin

Correct Answer

Option A

Solution

(a) Enterogastrone secreted by the mucosa of duodenum slows gastric contractions and stops the secretion of gastric juice.

Q73

The technique used for estimation of minute amounts of hormones and drugs is called

A electrophoresis

B electroencephalogram

C fractionation

D radioimmunoassay

Correct Answer

Option D

Solution

(d) Radioimmunoassay (RIA) is used for estimation of minute amounts of hormones and drugs.

Q74

Which one of the following hormones is a modified amino acid?

A Epinephrine

B Progesterone

C Prostaglandin

D Estrogen

Correct Answer

Option A

Solution

(a) Epinephrine is synthesized from amino acid tyrosine.

Q75

Chemically hormones are

A biogenic amines only

B proteins, steroids and biogenic amines

C proteins only

D steroids only

Correct Answer

Option B

Solution

(b) Hormones are amines (like melatonin), amino acids (thyroxine), peptides (insulin), or steroids (aldosterone).

Q76

Mast cells of connective tissue contain

A vasopressin and relaxin

B heparin and histamine

C heparin and calcitonin

D serotonin and melanin

Correct Answer

Option B

Solution

(b) Mast cells contain histamine (vasodilator) and heparin (anticoagulant).

Q77

Parkinson's disease is caused by degeneration of brain neurons that use neurotransmitter

A acetylcholine

B norepinephrine

C dopamine

D GABA

Correct Answer

Option C

Solution

(c) Parkinson's disease develops due to deficiency of neurotransmitter dopamine.

Q78

Which hormone causes dilation of blood vessels, increased oxygen consumption and glucogenesis?

A Insulin

B Adrenaline

C Glucagon

D ACTH

Correct Answer

Option B

Solution

(b) Adrenaline (Fight-or-Flight hormone) is responsible for dilation of blood vessels, increased oxygen consumption and glucogenesis.

Q79

Which one of the following does not act as a neurotransmitter?

A Epinephrine

B Norepinephrine

C Cortisone

D Acetylcholine

Correct Answer

Option C

Solution

(c) Cortisone is not a neurotransmitter. Epinephrine, norepinephrine and acetylcholine are neurotransmitters.