CBSE Class 11 Biology Chemical Coordination and Integration MCQs Set A

Question : Chemically hormones are

a) proteins, steroids and biogenic amines

b) proteins only

c) steroids only

d) biogenic amines only

Answer : proteins, steroids and biogenic amines

Question : The blood calcium level is lowered by the deficiency of

a) parathormone

b) thyroxine

c) both calcitonin and parathormone

d) calcitonin

Answer : parathormone

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

a) radioimmunoassay

b) electroencephalogram

c) fractionation

d) None of these

Answer : radioimmunoassay

Question : Testosterone is produced by

a) leydig’s cells

b) pituitary gland

c) Both

d) None of these

Answer : leydig’s cells

Question : Which one of the following is not a second messenger in hormone action ?

a) Sodium

b) cGMP

c) Calcium

d) cAMP

Answer : Sodium

Question : The phase of menstrual cycle in humans that lasts for 7-8 days, is

a) ovulatory phase

b) menstruation

c) luteal phase

d) follicular phase

Answer : ovulatory phase

Question : Blood glucose level in man is regulated by

a) glucagon and insulin

b) All of the above

c) adrenaline

d) insulin

Answer : glucagon and insulin

Question : Which of the following glands grows to the maximum size at puberty and then diminishes gradually?

a) Thymus

b) Thyroid

c) Pituitary

d) Adrenal

Answer : Thymus

Question : Hypoglycemic hormone is

a) Insulin

b) Thyroxine

c) Glucagon

d) Calcitonin

Answer : Insulin

Question : Which hormone interacts with membrane bound receptor and does not normally enter the target cell ?

a) Follicle stimulating hormone

b) Estrogen

c) Thyroxin

d) Cortisol

Answer : Follicle stimulating hormone

Question : The 24 hour (diurnal) rhythm of our body such as the sleepwake cycle is regulated by the hormone

a) Melatonin

b) Prolactin

c) Adrenaline

d) Calcitonin

Answer : Melatonin

Question : Steroid hormones transmit their information by

a) the help of an intracellular second messenger

b) entering into the cell and modifying nuclear organization

c) entering into the cell and modifying cellular contents

d) stimulating the receptors present on cell membrance

Answer : the help of an intracellular second messenger

Question : Increase in bleeding time and delay in blood coagulation is due to the deficiency of which hormone?

a) Parathormone

b) Adrenaline

c) Noradrenaline

d) Thyroxine

Answer : Parathormone

Question : Estrogen and testosterone are steroid hormones, and most likely bind to

a) cytoplasmic receptors

b) G-protein coupled membrane receptors

c) enzyme-linked membrane reseptors

d) membrane ion channels

Answer : cytoplasmic receptors

Question : The only unicellular exocrine glands in our body are

a) Mucus secreting goblet cells

b) Mammary glands

c) Sebaceous glands

d) Sweat glands

Answer : Mucus secreting goblet cells

Question : Steroid-based hormones are able to act inside the cell. This is possible because

a) steroid-based hormones are hydrophobic molecules that can pass through the cell membrane

b) proteins carry them into the cell.

c) hormones must interact with the nucleus to have an effect.

d) there are no receptors for hormones on the cell surface

Answer : steroid-based hormones are hydrophobic molecules that can pass through the cell membrane

Question : Target cells

a) Both

b) react specifically to a chemical messenger

c) react specifically to a chemical messenger

d) None of these

Answer : Both

Question : Researchers have found increased levels of hormones from the _____ in the blood of students preparing for final exams. These hormones are produced in response to stress

a) adrenal glands

b) pineal gland

c) thyroid gland

d) posterior pituitary

Answer : adrenal glands

Question : Hormones generally cause a response in a cell by

a) binding with a receptor and stimulating protein production

b) changing the polarity of the cell membrane and causing a cascade of events within the cell.

c) halting all other cellular activity except the required response

d) interacting directly with the cell’s DNA

Answer : binding with a receptor and stimulating protein production

Question : Hormones are produced at a particular centralized site and transported throughout the organism by means of

a) an internal transport system

b) cellular communication

c) an integrated neural pathway system

d) a series of synapses

Answer : an internal transport system