Question

The initial acceptor of electrons among the cytochromes in the respiratory chain is .............

• A. cytochrome - a3
• B. cytochrome - a
• C. cytochrome - c
• D. cytochrome - b-c1

Hint:

In the electron transport chain, cytochrome b-c1 is the first cytochrome to accept electrons, which are passed along to other cytochromes for ATP production.

Answer 1

The Correct Option is D

Step 1: Understanding the electron transport chain.
In cellular respiration, the electron transport chain is the final stage of aerobic respiration, where electrons are passed through a series of cytochromes. The initial electron acceptor is cytochrome b-c1.
Step 2: Analyzing the options.
(A) cytochrome - a3: Incorrect, cytochrome a3 is not the initial acceptor in the chain.
(B) cytochrome - a: Incorrect, it is not the first in the series of electron acceptors.
(C) cytochrome - c: Incorrect, cytochrome c is involved later in the electron transport chain.
(D) cytochrome - b-c1: Correct, this is the initial electron acceptor in the chain.
Step 3: Conclusion.
The correct answer is (D) cytochrome - b-c1, as it is the first cytochrome in the electron transport chain to accept electrons.