The metabolic engine: How cells harvest energy from carbon
In short: This video breaks down the Krebs cycle, a fundamental stage of aerobic respiration. It explains how your body transforms fuel into usable energy by tracking the chemical transformations that power life at a cellular level.
The Krebs cycle follows glycolysis and the link reaction to facilitate oxidative phosphorylation. The process begins when acetyl coenzyme A reacts with oxaloacetate, a four-carbon intermediate. Through a series of decarboxylation and dehydrogenation steps, the cycle generates ATP via substrate-level phosphorylation.
A critical component of this mechanism is the role of coenzymes—specifically Coenzyme A, NAD, and FAD. These act as oxidising agents that facilitate the transfer of electrons. While both NAD and FAD are essential for aerobic respiration, they possess distinct functional differences in how they process these molecules.
Opens the Intellect+ feed with this card first. Swipe up for the next one.
Sources
- Summary by Intellect · source: A-Level Biology - Krebs Cycle - What It Is | Key Stages | Role of Coenzymes (2027/28 exams)
To cite this card, link to https://intellectplus.co.uk/app/science-a-level-biology-krebs-cycle-what-it-is-key-stages-role-of-co.
How we source, check and correct cards: Editorial standards.
General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.
Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?
Related
More in Biology · More in Science · Latest · A–Z · All topics
