Question

Read the following statements and select the option which identifies the incorrect ones. (i) Potato spindle tuber disease and Chrysanthemum stunt disease are caused by viroids. (ii) $T_{4}$ bacteriophage exhibits lytic cycle. (iii) Retroviruses have two copies of $ssRNA$. (iv) Interferons which prevent viral multiplication are glycolipid particles.

• A. (ii) and (iii)
• B. (i) and (iv)
• C. (iii) only
• D. (iv) only

Answer 1

Answer: (D)

(iv) only

Answer 2

Interferons are proteins that increase the resistance of cells to attack by virus. Interferons are produced commercially for therapeutic purposes using genetically engineered bacteria or human tissue culture.