Match the event with its most suitable description....

Match the event with its most suitable description. ________glycolysis ________fermentation ________Krebs cycle ________electron transfer phosphorylation a. ATP, NADH, FADH and $\mathrm{CO}_{2}$ form b. glucose to two pyruvates c. NAD + regenerated, little ATP d. $\mathrm{H}^{+}$ flows through ATP synthases

Match the event with its most suitable description.
________glycolysis
________fermentation
________Krebs cycle
________electron transfer phosphorylation
a. ATP, NADH, FADH and $\mathrm{CO}_{2}$ form
b. glucose to two pyruvates
c. NAD + regenerated, little ATP
d. $\mathrm{H}^{+}$ flows through ATP synthases

Key Concepts

Glycolysis

Glycolysis is the first step of cellular respiration where one molecule of glucose is broken down into two molecules of pyruvate, producing a small yield of ATP and NADH in the process. This pathway occurs in the cytoplasm and is independent of oxygen, making it a fundamental process in both aerobic and anaerobic conditions.

Fermentation

Fermentation is an anaerobic process that follows glycolysis in the absence of oxygen, allowing glycolysis to continue by regenerating NAD+ from NADH. Although it yields much less ATP compared to aerobic respiration, fermentation is crucial for maintaining energy production when oxygen supplies are limited.

Krebs cycle

The Krebs cycle, also known as the citric acid cycle, is a series of biochemical reactions that takes place in the mitochondria after glycolysis. It oxidizes acetyl-CoA, derived from pyruvate, to produce electron carriers (NADH and FADH2), a small amount of ATP, and releases carbon dioxide as a waste product.

Electron transfer phosphorylation

Electron transfer phosphorylation, often referred to as oxidative phosphorylation, is the process by which electrons from NADH and FADH2 travel through the electron transport chain in the mitochondrial inner membrane. This movement creates a proton gradient that drives the ATP synthase enzyme to produce ATP, and water is formed when electrons combine with oxygen.

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