An adenine-containing nucleoside triphosphate that releases free energy when its phosphate bonds are hydrolyzed.Group of answer choicesNADHNAD⁺NADPHATPADP

To identify the correct adenine-containing nucleoside triphosphate that releases free energy when its phosphate bonds are hydrolyzed, let's analyze the given options:

1. NADH: This is not a nucleoside triphosphate; rather, it is a reduced form of nicotinamide adenine dinucleotide (NAD⁺) and is involved in redox reactions.

2. NAD⁺: Similar to NADH, NAD⁺ is not a nucleoside triphosphate but rather a coenzyme that functions in redox reactions.

3. NADPH: This molecule is involved in anabolic reactions and is an electron donor, but it is not specifically a nucleoside triphosphate.

4. ATP (Adenosine Triphosphate): This is commonly known as the energy currency of the cell. It consists of adenine, ribose, and three phosphate groups. When the high-energy phosphate bonds in ATP are hydrolyzed, it releases energy that can be harnessed for cellular processes.

5. ADP (Adenosine Diphosphate): While hydrolysis of ADP can release energy, it is not a triphosphate; it is a diphosphate form of ATP.

Final Answer

The correct answer is ATP (Adenosine Triphosphate), as it is the adenine-containing nucleoside triphosphate that releases free energy when its phosphate bonds are hydrolyzed.