What is the advantage of using antihistamines over antacids in the treatment of acidity?
Antacids neutralise the acid produced in the stomach. They do not control the cause of production of excess acid. Therefore, antacids control only the symptoms but not the cause. On the other hand, antihistamines are the drugs which suppress the action of histamine which is the chemical responsible for stimulation of secretion of pepsin and HCl in the stomach. These influence and prevent the binding of histamine with the receptors present in the stomach wall resulting in lower acid production and therefore, better treatment. This is the advantage of antihistamines over antacids.
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.
Assertion (A): Preservative are added to food items.
Reason (R): Preservatives inhibit the growth of microorganisms.
Synthetic detergents have advantage over usual soaps as far as cleansing power is concerned. But use of synthetic detergents over a long time creates environmental pollution. How can the pollution caused by synthetic detergents be minimized? Classify the detergents according to their chemical nature.
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.
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?
Which of the following are not used as food preservatives?
(a) Table salt (b) Sodium hydrogen carbonate
(c) Cane sugar (d) Benzoic acid
With the help of an example explain how do tranquilizers control the feeling of depression?
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
Compounds with antiseptic properties are
(a) CHCl, (b) CHI3
(c) Boric acid (d) 0.3 ppm aqueous solution of Cl2
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.
Both antacids and antiallergic drugs are antihistamines but they cannot replace each other. Explain why?
Explain why sometimes foaming is seen in river water near the place where sewage water is poured after treatment?
Name two ct-amino acids which form a dipeptide which is 100 times more sweet than cane sugar?
Assertion (A): Receptors are crucial to body's communication process. Reason (R): Receptors are proteins.
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.
Why are cimetidine and ranitidine better antacids than sodium hydrogencarbonate or magnesium or aluminium hydroxide?
How does the branching of hydrocarbon chain of synthetic detergents affect their biodegradability?
Sodium salts of some acids are Very useful as food preservatives. Suggest a few such acids.
Match the class of compounds given in Column I with their functions given in Column II.
Assertion (A): Chemical messenger gives message to the cell without entering the cell.
Reason (R): Chemical messenger is received at the binding site of receptor proteins.
Assertion (A): All chemicals added to food items are called food preservatives.
Reason (R): All these chemicals increase the nutritive value of the food.
In what respect do prontosil and Salvarsan resemble? Is there any resemblance between azo dye and prontosil? Explain.
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?
With refrence to which classification has the statement "ranitidine is an antacid", been given?