Pickles have a long shelf life and do not get spoiled for months, why?
Table salt, sugar vegetable oils and sodium benzoate, etc. are used as preservatives. These do not allow moisture and air to enter the material and hence, bacteria cannot thrive on them. Therefore, pickles do not get spoiled for months.
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.
While antacids and antiallergic drugs interfere with the function of histamines, why do these not interfere with the function of each other?
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.
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 happens when the bond formed between an enzyme and an inhibitor is a strong covalent bond?
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.
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
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?
Which of the following compounds are administered as ant-acids?
(a) Sodium carbonate (b)Sodium Hydrogen carbonate
(c)Aluminium carbonate (d)Magnism Hydroxide
Assertion (A): Receptors are crucial to body's communication process. Reason (R): Receptors are proteins.
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?
Name two ct-amino acids which form a dipeptide which is 100 times more sweet than cane sugar?
Sodium salts of some acids are Very useful as food preservatives. Suggest a few such acids.
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): 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): Transparent soaps are made by dissolving soaps in ethanol. Reason (R): Ethanol makes things invisible.
