Question

Given below are two statements:
Statement (I): \(\text{NADH}_{2}\) (\(\text{NADH}+\text{H}^{+}\)) and \(\text{FADH}_{2}\) that are produced during glycolysis, connecting link reaction and Krebs cycle, are oxidised with the help of various electron carriers and enzymes.
Statement (II): These carriers and enzymes are arranged in the cytoplasm in the form of various complexes as complex I, II, III, IV and V.
In light of the above statements, choose the most appropriate answer from the options given below.

• A. Both Statement (I) and Statement (II) are true.
• B. Both Statement (I) and Statement (II) are false.
• C. Statement (I) is true but Statement (II) is false.
• D. Statement (I) is false but Statement (II) is true.

Hint:

NADH and FADH2 are oxidised through the ETS, but the ETS is in the inner mitochondrial membrane, not the cytoplasm.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
The electron transport system (ETS) re-oxidises reduced coenzymes made in earlier steps of respiration.

Step 2: Statement (I)
The \(\text{NADH} + \text{H}^{+}\) and \(\text{FADH}_{2}\) from glycolysis, the link reaction and the Krebs cycle give their electrons to a chain of carriers and enzymes. Statement (I) is true.

Step 3: Statement (II)
The carriers and enzymes forming complexes I, II, III, IV and V are located in the inner mitochondrial membrane, not in the cytoplasm. Statement (II) is false.

Final Answer:
Statement (I) is true but Statement (II) is false. \[ \boxed{\text{(C) }\text{Statement (I) is true but Statement (II) is false.}} \]