1. In an earthworm nerve impulse transmission experiment, students were asked to

Question

1. In an earthworm nerve impulse transmission experiment, students were asked to test the inhibitory effects of some unknown compounds. Upon the addition the students observed that there was no action potential generation at all. On comparing to the known compounds mentioned below, predict the unknown compound?

a) lidocaine

b) curare

c) pilocarpine

d) ether

e) none of the above

2. If you place the Elodea leaf inside an unknown solution and see the insides of the cells peel away from the cell wall. What kind of tonicity is the cell experiencing?

a) crenation

b) lysis

c) plasmolysis

d) cytolysis

e) isotonic

3. An inhaler used to treat airway constriction in asthma or allergy might contain a drug that?

a) activates beta 1-adrenergic receptors.

b) activates beta 2-adrenergic receptors.

c) activates muscarinic cholinergic receptors.

d) blocks beta 2-adrenergic receptors.

e) activates beta 2-adrenergic receptors or activates muscarinic cholinergic receptors.

Explanation / Answer

1)

lidocaine : No action potential was generated before or after stimulation; it was inhibitory action. Hence option A is correct

curare : It facilitatory effects of alpha -adrenoceptor agoinst on skeletal neuromuscular transmission in earth worms. Hence option B is incorrect

pliocarpine: Hence option C is incorrect

ether : Hence option D is incorrect

None of the above : Hence option E is incorrect

2)

Crenation: It is described as shrinkage of cell that occurs when the surrounding solution is hypertonic to the cellular cytoplasm. Plasma membrane to wrinkle. Hence option A is incorrect

lysis : It is breakdown of the membrane of a cell by viral, enzymatic or osmotic. Hence option B is incorrect

plasmolysis : The process in which cells lose water in a hypertonic solution.    Hence option C is correct

Cytolysis : It is also called as osmotic lysis when cell brusts and release its content into extracellular enivornment. Hence option D is incorrect.

Isotonic : it refers to two solution same osmotic pressure across the semipermeable membrane. Hence option D is incorrect

3)

Activates beta 1-adrenergic receptors. Hence option A is incorrect

Activates beta 2-adrenergic receptors. Hence option B is correct

Activates muscarinic cholinergic receptors. Hence option C is incorrect

blocks beta 2-adrenergic receptors. Hence option D is incorrect

Activates beta 2-adrenergic receptors or activates muscarinic cholinergic receptors. Hence option E is incorrect

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