Multiple Choice QuestionsWhich of the following statement(s) are true?
Antibiotics can kill bacteria, but disinfectants do not
Disinfectants have better bactericidal efficiency than antibiotics
Antibiotics are of microbial origin, but disinfectants are chemical compounds
Antibiotics can be injected into the patients, whereas disinfectants are not
Which one of the following natural polymers is found both in insects and fungi?
Pectin
Chitin
Cellulose
Suberin
Which one of the following antibiotics kills bacterial cells by inhibiting the polymerisation of peptidoglycan?
Aminoglycosides
Fluoroquinolones
Quinines
Penicillins
D.
Penicillins
Some antibacterial drugs such as periicillin interfere with the production of peptidoglycan by binding to bacterial enzymes known as penicillin-binding proteins or transpeptidases. For a bacterial cell to reproduce, more than a million peptidoglycan subunits must be attached to existing subunits. Transpeptides form the bonds between oligopeptide crosslinks in peptidoglycan-penicillin inhibit this binding and kills bacterial cells.
Which one of the following organisms is not used as a biocontrol agent?
Bacillus sphaericus
Trichoderma viride
Bacillus thuringiensis
Bacillus subtilis
Which one of the following insecticides is of plant origin?
Ecdysone
Rotenone
Parathion
Malathion
Curdling of milk in small intestine occurs due to the action of
trypsin
erypsin
rennin
chymotrypsin
Switch
