A good producer of citric acid is

• Aspergillus

• Pseudomonas

• Clostridium

• Saccharomyces

Which 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

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

Mycoplasma is resistant for

• penicillin

• tetracycline

• streptomycin

• All of the above

Who coined the term antibiotics ?

• Woodruff

• Darwin

• Selman Waksman

• A Fleming

Which compound has very important role in prebiotic evolution ?

• SO₂

• NO

• CH₄

• SO₃

70.

Curdling of milk in small intestine occurs due to the action of

• trypsin

• erypsin

• rennin

• chymotrypsin