Which statement is incorrect about Lock and Key Model_____.

1. 1. Active site of an enzyme is a non flexible structure
   2. Specific enzyme can transform only a specific substrate
   3. It explains the mechanism of every chemical reaction
   4. Active site does not change before during or even after the reaction

The branch of biology which deals with the study of chemical compounds and the chemical processes in the living organisms is called_____.

1. 1. Chemistry
   2. Molecular biology
   3. Insect biology
   4. Biochemistry

The mechanism of regulation, generally between organism and its environment, of solutes and the gain and the loss of water is called_____.

1. 1. Anhydrobiosis
   2. Thermoregulation
   3. Hemostasis
   4. Osmoregualtion

_____ stimulates the production of gastric juice in the stomach.

1. 1. Rennin
   2. Enterokinase
   3. Gastrin
   4. All of these

An antibody is made of _____polypeptide chains?

1. 1. 2
   2. 3
   3. 4
   4. 5

Which of the following viruses has caused thousands of deaths globally as an ’emergent’ virus?

1. 1. SARS-CoV-2
   2. OC43
   3. HKUt
   4. MERS

Nephrostome in earthworm opens in_____.

1. 1. Internal Body cavity
   2. In gut
   3. In Bladder
   4. External space

Which of the following type of plastids help in pollination?

1. 1. Leucoplasts
   2. Chromoplasts
   3. Chloroplasts
   4. All of these

A pressure created by active secretion of salts and other solutes from other cells into xylem sap is called_____.

1. 1. Osmotic pressure.
   2. Transpiration pull
   3. Root pressure
   4. All of these

Temperate phage may exist as_____.

1. 1. Prophage
   2. Virion
   3. Retrovirus
   4. Capsid