The amino acid, tryptophan is the precursor for the synthesis of?
1. thyroxine and tri-iodothyronine
2. estrogen and progesterone
3. cortisol and cortisone
4. melatonin and serotonin

Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other?

1. a

2. b

3. c

4. d

Match the source gland with its respective hormone as well as the function. 

Which one of the following is an example of a negative feedback loop in humans?

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

1. Acetylcholine

2. Epinephrine

3. Nor epinephrine

4. Cortisone

Steroid hormones work as:

1. They enter into target cells and bind with specific receptors and activate specific genes to form protein

2. They bind to cell membrane

3. They catalyze the formation of cAMP

4. None of the above

Adrenaline and noradrenaline are hormones that act as:

1. Energy-producing agents

2. Food storage materials

3. Neurotransmitters

4. Energy-storing substances

Calcitonin is a thyroid hormone, which:

1. elevates potassium level in blood

2. lowers calcium level in blood

3. elevates calcium level in blood

4. has no effect on calcium

The contraction of the gall bladder is due to:

1. gastrin

2. secretin

3. cholecystokinin

4. enterogastrone

Glycogenolysis involves:

1. conversion of sugar into glycogen

2. oxidation of sugar

3. conversion of glycogen into sugar

4. conversion of glycogen into fat