Assertion (A): Receptors are crucial to body's communication process. Reason (R): Receptors are proteins.
(a) Neurotransmitters are small molecular which bind to the receptor for a very short time to transfer message to it and depart quickly unchanged after transferring the message, the receptor then forwards the message inside the cell. Receptors are proteins and they participate in the communication system of our body.
Which of the following are anionic detergents?
(a) Sodium salts of sulphonated long chain alcohol.
(b) Ester of stearic acid and polyethylene glycol.
(c) Quaternary ammonium salt of amine with acetate ion.
(d) Sodium salts of sulphonated long chain hydrocarbons.
If soap has high alkali content it’irritates skin. How can the amount of excess alkali be determined? What can be the source of excess alkali?
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. .
While antacids and antiallergic drugs interfere with the function of histamines, why do these not interfere with the function of each other?
Assertion (A): Non-competitive inhibitor inhibits the catalytic activity of enzyme by binding with its active site.
Reason (R): Non-competitive inhibitors changes the shape of the active site in such a way that substrate cannot recognize it.
Assertion (A): All chemicals added to food items are called food preservatives.
Reason (R): All these chemicals increase the nutritive value of the food.
Why are cimetidine and ranitidine better antacids than sodium hydrogencarbonate or magnesium or aluminium hydroxide?
Both antacids and antiallergic drugs are antihistamines but they cannot replace each other. Explain why?
Between sodium hydrogen carbonate and magnesium hydroxide which is a better antacid and why?
What happens when the bond formed between an enzyme and an inhibitor is a strong covalent bond?
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.
Compounds with antiseptic properties are
(a) CHCl, (b) CHI3
(c) Boric acid (d) 0.3 ppm aqueous solution of Cl2
How do enzymes catalyse a chemical reaction in the living system? Explain drug target interaction taking the example of enzyme as target.
With refrence to which classification has the statement "ranitidine is an antacid", been given?
Name two ct-amino acids which form a dipeptide which is 100 times more sweet than cane sugar?
Assertion (A): Chemical messengers are chemicals that enable communi ¬cation of message between two neutrons or between neurons and muscles. Reason (R): Chemicals enter the cell through receptor.
Assertion (A): Preservative are added to food items.
Reason (R): Preservatives inhibit the growth of microorganisms.
In what respect do prontosil and Salvarsan resemble? Is there any resemblance between azo dye and prontosil? Explain.
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
Sleeping pills are recommended by doctors to the patients suffering from sleeplessness but it is not advisable to take its doses without consultation with the doctor. Why?
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.
Which of the following are not used as food preservatives?
(a) Table salt (b) Sodium hydrogen carbonate
(c) Cane sugar (d) Benzoic acid
