During photorespiration, the oxygen consuming reaction(s) occur in:

1. stroma of chloroplasts and mitochondria

2. stroma of chloroplasts and peroxisomes

3. grana of chloroplasts and peroxisomes

4. stroma of chloroplasts

Which one of the following is an example of polygenic inheritance?

1. Flower colour in Mirabilis jalapa

2. Production of male honey bee

3. Pod shape in garden pea

4. Skin colour in humans

Which one of the following does not act as a neurotransmitter?

1. Acetylcholine

2. Epinephrine

3. Nor epinephrine

4. Cortisone

Sertoli cells are regulated by the pituitary hormone known as:

1. FSH

2. GH

3. Prolactin

4. LH

A steroid hormone which regulates glucose metabolism is:

1. cortisol

2. corticosterone

3. 11-deoxycorticosterone

4. cortisone

The contractile protein of skeletal muscle involving ATPase activity is:

Which one of the following is not a second messenger in hormone action?

1. cGMP

2. Calcium

3. Sodium

4. cAMP

In Mendel's experiments with garden peas, round seed shape (RR) was dominant over wrinkled seeds (rr), and yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F₂ generation of the cross RRYY x rryy?

One gene – one enzyme hypothesis was postulated by:

1. R. Franklin

2. Hershey and Chase

3. A. Garrod

4. Beadle and Tatum

One turn of the helix in a B-form DNA is approximately: