What are the functions performed by histamine in the body?
Histamine is a potent vasodilator. It contracts muscles in the gut and bronchi. It relaxes some other muscles e.g., in the’walls of fine blood vessels. Histamine is also responsible for congestion in the nose associated with common cold and allergies. Histamine stimulates the release of pepsin and hydrochloric acid in the stomach.
With refrence to which classification has the statement "ranitidine is an antacid", been given?
Compounds with antiseptic properties are
(a) CHCl, (b) CHI3
(c) Boric acid (d) 0.3 ppm aqueous solution of Cl2
While antacids and antiallergic drugs interfere with the function of histamines, why do these not interfere with the function of each other?
How does the branching of hydrocarbon chain of synthetic detergents affect their biodegradability?
What are enzyme inhibitors? Classify them on the basis of their mode of attachments on the active site of enzymes. With the help of diagrams explain how do inhibitors inhibit the enzymatic activity.
Ckemistnj in Evenjdai] Life 325
What happens when the bond formed between an enzyme and an inhibitor is a strong covalent bond?
Match the class of compounds given in Column I with their functions given in Column II.
Assertion (A): Transparent soaps are made by dissolving soaps in ethanol. Reason (R): Ethanol makes things invisible.
Assertion (A): Receptor proteins show selectivity for one chemical messenger over the other.
Reason (R): Chemical messenger binds to the receptor site and inhibits its natural function.
Why are cimetidine and ranitidine better antacids than sodium hydrogencarbonate or magnesium or aluminium hydroxide?
Which of the following are not used as food preservatives?
(a) Table salt (b) Sodium hydrogen carbonate
(c) Cane sugar (d) Benzoic acid
Which of the following compounds are administered as ant-acids?
(a) Sodium carbonate (b)Sodium Hydrogen carbonate
(c)Aluminium carbonate (d)Magnism Hydroxide
With the help of an example explain how do tranquilizers control the feeling of depression?
Name two ct-amino acids which form a dipeptide which is 100 times more sweet than cane sugar?
In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices:
(a) Assertion and reason both are correct statements but reason does not explain assertion.
(b) Assertion and reason-both are correct statements and reason explains the assertion.
(c) Both assertion and reason are wrong statement.
(d) Assertion is correct statement and reason is wrong statements.
(e) Assertion is wrong statements and reason is correct statement.
Assertion (A): Penicillin (G) is an antihistamine.
Reason (R): Penicillin (G) is effective against gram positive as well as gram negative bacteria. .
Assertion (A): Preservative are added to food items.
Reason (R): Preservatives inhibit the growth of microorganisms.
Assertion (A): Artificial sweeteners are added to the food to control the intake of calories.
Reason (R): Most of the artificial sweeteners are inert and do not metabolise in the body.
Write the chemical equation for preparing sodium soap from glyceryl oleate and glyceryl palmitate. Structures of these compounds are given below:
(i)(C15H31COO)3C3H5-Glyceryl palmitate
(ii)(C17H32COO)3C3H5-Glyceryl oleate
Which of the following statements are incorrect about receptor proteins?
(a) Majority of receptor proteins are embedded in the cell membranes.
(b) The active site of receptor proteins opens on the inside region of the cell.
(c) Chemical messengers are received at the binding sites of receptor proteins.
(d) Shape of receptor does not change during attachment of messenger.
Aspirin is pain relieving antipyretic drug but can be used to prevent heart attack. Explain.
Assertion (A): Receptors are crucial to body's communication process. Reason (R): Receptors are proteins.
Assertion (A): Sodium chloride is added to precipitate soap after saponification.
Reason (R): Hydrolysis of esters of long chain fatty acids by alkali produces soap in colloidal form.
How do enzymes catalyse a chemical reaction in the living system? Explain drug target interaction taking the example of enzyme as target.
