Nitrogen Metabolism Part 3

Question 1

What form of metal ions do porphyrins readily bind?

Answer 1

Fe2+ or Fe3+

Question 2

Describe the side chains of a Type 1 porphyrin ring?

Answer 2

Side chains are arranged symetrically. (They alternate AP-AP-AP-AP)

Question 3

Describe the basic structure of a porphyrin ring?

Answer 3

4 Pyrrole rings, joined though methenyl bridges.

Question 4

Describe the side chains of a Type 3 porphyrin ring?

Answer 4

Side chains are arranged asymetrically. ( AP-AP-AP-PA)

Reversed in the D ring.

Question 5

Significance of Type 3 porphyrin ring?

Answer 5

Only type important in humans.