My Exam Results: Cellular Respiration
Overall Assessment
95%
Excellent Work!
Q1: Explain why the Krebs Cycle is considered a "cycle" and describe its main purpose.
MY ANSWER
It's called a cycle because the starting molecule, oxaloacetate, is regenerated at the end of the series of reactions, allowing it to begin again. Its purpose is to break down acetyl-CoA and produce a lot of NADH and FADH2, which are energy carriers for the next stage.
AI FEEDBACK (10/10)
This is a perfect answer. You correctly identified both key aspects of the question: the regeneration of oxaloacetate defining it as a cycle, and the primary purpose of producing high-energy electron carriers (NADH and FADH2) rather than direct ATP production. Great job!
Q2: What is the net ATP yield from glycolysis, and where does this process occur in the cell?
MY ANSWER
The net yield is 2 ATP. It happens in the mitochondria.
AI FEEDBACK (5/10)
You are correct about the net yield of 2 ATP from glycolysis. However, the location is incorrect. Glycolysis occurs in the cytoplasm of the cell, not the mitochondria. The products of glycolysis (pyruvate) then move into the mitochondria for the subsequent stages. This is a key distinction to remember.