Which of the following statements are correct?
P. Viruses can play a role in causing human cancer.
Q. A tumor suppressor gene can be turned off without any change in its DNA sequence.
R. Alteration in miRNA expression levels contributes to the development of cancer.

In leguminous plants, both the rhizobium genes and the plant genes influence nodulation and nitrogen fixation. Which one of the following functions is not encoded by the host plant genes?

A. Production of inducers that modify rhizobial cell wall

B. Production of flavonoid inducers

C. Establishment of contact between bacteria and legume

D. Root hair curling

Which one of the following organisms is used for the determination of phenol coefficient of a disinfectant?

A. Salmonella typhi

B. Escherichia coli

C. Candida albicans

D. Bacillus psychrophilus

Match the cell structures in Group I with the organisms in Group II.

A. P-4, Q-3, R-1, S-2

B. P-4, Q-3, R-2, S-1

C. P-3, Q-4, R-1, S-2

D. P-4, Q-1, R-3, S-2

Match the human diseases in Group I with the causative agents in Group II.

A. P-3, Q-4, R-2, S-1

B. P-3, Q-2, R-1, S-4

C. P-3, Q-4, R-1, S-2

D. P-4, Q-3, R-1, S-2