scject~~
1. Fruits can be stored for a longer period at around 4oC because at this temperature
(1) the growth of microorganisms are inhibited.
(2) the proteins in the fruits are denatured.
(3) the enzymes in the fruits are inactivated.
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
2. Which of the following statements about antibiotics is NOT correct?
A. Antibiotics are produced by microorganisms.
B. Antibiotics inhibit the growth of microorganisms.
C. Antibiotics combine with antigens of pathogens.
D. Antibiotics do not kill human cells.
3. Which of the following can increase the nitrate content of soil ?
(1) growing maize year after year
(2) burying dead animals into soil
(3) thunderstorm
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
