Biology MCQs

Question 1

Digestion starts in man from

Accepted Answer

Mouth

Answer

Rectum

Answer

Stomach

Answer

Intestine

Question 2

Where does digestion of protein begins?

Accepted Answer

Stomach

Answer

Mouth

Answer

Pharynx

Answer

Liver

Question 3

After digestion protein is converted into

Accepted Answer

Amino acid

Answer

Fat

Answer

Glucose

Answer

Fractose

Question 4

Digestion of starch in mouth takes place by

Accepted Answer

Ptyline

Answer

Amylase

Answer

Pepsin

Answer

Lipase

Question 5

What prevents food from entering the windpipe?

Accepted Answer

Epiglottis

Answer

Pharynx

Answer

Trachea

Answer

Larynx

Question 6

Which of the following is true of enzymes?

Accepted Answer

Both A & B

Answer

Enzymes lowers the activation energy for the chemical reaction

Answer

Enzymes speed up the rate of a chemical reaction

Answer

Neither A nor B

Question 7

The substances, which assist enzymes act, are called

Accepted Answer

Substrates

Answer

Diastase

Answer

Co-enzymes

Answer

None of the above

Question 8

Biological catalysis in living organisms are known as

Accepted Answer

Enzymes

Answer

Hormones

Answer

Vitamins

Answer

Steroids

Question 9

Which of the following is not a function of saliva?

Accepted Answer

Contains fluoride to harden the tooth enamel

Answer

Moistens food and helps stick it together to make it easier to swallow

Answer

Begins the chemical breakdown of starches

Answer

Helps clean the mouth