Question

Identify the ATP producing reaction.

1) Photosynthesis
2) Glycolysis
3) Krebs cycle
4) Electron transport chain

Answer 1

The processes that produce ATP are glycolysis, Krebs cycle (citric acid cycle), and the electron transport chain. All these steps are part of cellular respiration and they sequentially contribute to the generation of ATP.

Step-by-step explanation:

The student is asking which processes produce adenosine triphosphate (ATP). Among the options provided:

• Glycolysis: This is the first step in cellular respiration where glucose is converted into pyruvate, producing a net gain of ATP.
• Krebs cycle: Also known as the citric acid cycle, this stage further oxidizes acetyl CoA to produce NADH and FADH2, which are used in the next stage to generate ATP.
• Electron transport chain: Located in the inner mitochondrial membrane, this chain uses electrons from NADH and FADH2 to create a chemiosmotic gradient that drives the synthesis of ATP through oxidative phosphorylation.

All these three processes result in the production of ATP. Therefore, the answer is Glycolysis (2), Krebs cycle (3), and Electron transport chain (4). Photosynthesis does produce ATP, but it is used specifically within the photosynthetic process to make glucose, not for cellular activities.