Assertion(A): NAD+ is the most versatile electron acceptor in cellular respiration and functions in several of redox steps during the breakdown of glucose.
Reason(R): As an electron acceptor, NAD+ functions as an oxidizing agent during respiration.

1. Both (A) and (R) are true and (R) is the correct explanation of (A)
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  ETS |
Please attempt this question first.
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology

Oxidation of organic compounds by molecular oxygen results in the production of carbon dioxide and water and releases free energy. This is because:

1. High energy covalent bonds in organic molecules are broken to produce weaker covalent bonds in water and carbon dioxide.
2. Electrons are being moved from atoms that have a lower affinity for electrons to atoms with a higher affinity for electrons.
3. The electrons in water and carbon dioxide have higher potential energy than the electrons in organic compounds.
4. The covalent bonds in organic molecules are unstable and stable in water and oxygen.
Subtopic:  ETS |
To view explanation, please take trial in the course below.
NEET 2026 - Target Batch - Vital
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology

The mitochondrial proton gradient would be highest leading to ATP synthesis when the following condition is present:

1. pyruvate (present)-oxygen (present)-ATP levels (high)
2. pyruvate (present)-oxygen (present)-ATP levels (low)
3. pyruvate (present)-oxygen (absent)-ATP levels (high)
4. pyruvate (absent)-oxygen (present)-ATP levels (low)
Subtopic:  ETS |
To view explanation, please take trial in the course below.
NEET 2026 - Target Batch - Vital
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology