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.
Assertion (A): Transparent soaps are made by dissolving soaps in ethanol. Reason (R): Ethanol makes things invisible.
With refrence to which classification has the statement "ranitidine is an antacid", been given?
Assertion (A): Preservative are added to food items.
Reason (R): Preservatives inhibit the growth of microorganisms.
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?
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
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.
How does the branching of hydrocarbon chain of synthetic detergents affect their biodegradability?
Match the class of compounds given in Column I with their functions given in Column II.
Which of the following compounds are administered as ant-acids?
(a) Sodium carbonate (b)Sodium Hydrogen carbonate
(c)Aluminium carbonate (d)Magnism Hydroxide
Name two ct-amino acids which form a dipeptide which is 100 times more sweet than cane sugar?
What happens when the bond formed between an enzyme and an inhibitor is a strong covalent bond?
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?
Low level of noradrenaline is the cause of depression. What type of drugs are needed to cure this problem? Name two drugs.
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 statements are correct about barbiturates?
(a) Hypnotics or sleep producing agents.
(b) These are tranquilizers.
(c) Non-narcotic analgesics.
(d) Pain reducing without disturbing the nervous system.
Draw the diagram showing micelle formation by the following detergent. CH3(CH2)10CH2O SO3– Na+.
