Lack of which component in diet causes hypothyroidism?

Which of the following is soluble in water?

Which of the following disaccharides on hydrolysis with invertase gives two different monosaccharides?

Enzymes are regarded as __

What is the correct name of the following compound?

Starch : Plants : : X : Animals. Identify X.

Enzymes are basically __

Which hormone controls the balance of water and minerals in the body?