Question

Which of the following hormones contain iodine?
a. Adrenaline
b. Testosterone
c. Thyroxin
d. Insulin

Answer 1

Hint: Thyroid gland produces two iodine containing hormones referred as T3 and T4. Here, 3 and 4 digits represent the number of iodine atoms in one molecule of hormone.

Complete answer:
Lets check each available option one by one:
Adrenaline: This hormone is also known as epinephrine and it is a hormone as well as medication. It is produced by adrenal glands and some of the neurons in which it acts as neurotransmitters and helps in regulation of many processes like respiration. It is found in many animals as well as single-celled organisms.

Testosterone: It is a male sex hormone and anabolic steroid. It helps in development of male reproductive parts and also promotes secondary sexual characters. It is also involved in prevention of osteoporosis. Deficiency of Testosterone may lead to frailty and bone loss.
Thyroxin: It is also known as levothyroxine or T4 hormone, produced from thyroid. It is used to treat “myxedema coma”. It also helps in prevention of some types of tumours in thyroid. If an excessive amount of Thyroxine is present, it can lead to conditions like weight loss, sweating, anxiety, tremor and increased heart beat rate.

Insulin: It is a protein as well as hormone produced from pancreas and helps in food digestion. It helps in metabolism of carbohydrates, fats and protein by promoting absorption of glucose to liver, fat and skeletal muscles. Deficiency of insulin may lead to diabetes. And can be treated with insulin injections. It can be produced by recombinant DNA technology using bacteria.
Now, observing these options we can say that Option ‘C’ is the correct answer. We can also see given structures of hormones and identify that T4 hormone contains iodine in its structure.

Note: Insulin hormone is a peptide hormone means it has a long chain of amino acids thus it does not have a molecular formula.