Biology : Microbes in Human Welfare

Yeast is used in the production of :

• acetic acid

• citric acid

• ethyl alcohol

• curd

Streptomycin was isolated first time by :

• A. Flemming

• Robert Koch

• N. Borlaug

• S. Waksman

Which of the following micro-organism is used for conversion of milk into curd?

• Xanthomonas citri

• Bacillus megatherium

• Acetobacter aceti

• None of the above

Which of the following is the product of glucose fermentation by yeast?

• C₆H₁₂O₆

• C₂H₅OH

• (C₆H₁₀O₅)_n

• CH₂OH

The pesticide used as preventive measure in buildings is :

• aldrin

• dieldrin

• endrin

• DDT

Cheese and yogurt are the products of

• dehydration

• fermentation

• pasteurization

• distillation

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

• rennin

• erypsine

• trypsin

• chymotrypsin

Which of the following pesticides is an acetylcholinesterase inhibitor?

• Aldrin

• BHC

• Endosulfan

• Malathion

Chloromycetin is obtained from

• Streptomyces venezuelae

• Streptomyces rimosus

• Bacillus subtilis

• Clostridium botulinum

Ernest Chain and Howard Florey's contribution was

• discovery of streptokinase

• establishing the potential of penicillin as an effective antibiotic

• discovery of the DNA sequencer

• isolating the bacterial plasmid

• isolating the bacterial plasmid