1. Catalase is present in high level in:

• (B) peroxisomes

2. Neurons in adult brain are said to be quiescent because they are locked in:

• (A) G0 phase

3. Cyclic AMP activates glycogenolysis by activating:

• (A) phosphorylase a

4. Radiation tolerance in Deinococcus radiodurans is due to:

• (C) efficient repairing of fragmented DNA