Question

1. Find the correct statement(s):
(i) The electron transport proteins contain Cu and Fe metals.
(ii) For efficient electron transport, both the Gibbs energy and the reorganization energy have to be low.
(iii) Electron transport chains exist only in organisms that use O2 as oxidizing agent.
a. (ii) and (iii)
b. (i) and (iii)
c. (i) and (ii)

2. Zinc has several roles in living system. In which role you will not find this metal?
a. structural
b. catalytic
c. electron transfer

3. Enzymes containing vitamin B12 are involved in
a. radical reactions.
b. acid-base catalysis.
c. electron transport chain.

4. Mo and W are involved in oxygen atom transfer as
a. oxygen atom acceptors.
b. oxygen atom donors.
c. centres for activation of O=O bonds.

Answer 1

Option B is correct, means statement (i) & (iii) are correct in refererence to electron transport system.

Explanation :-

• Fe and Cu are most effective metal to transport electron because of their redox potential.
• The main function of electron transport is to produce ATP, additional important byproduct is water. At the end of the system, the electrons are accepted by oxygen molecules to make water molecule. Due to this oxygen acts as final electron acceptor, got reduce itself and it acts as oxidizing agent.