Match each term with its description.
-First step in cellular respiration
A)Cytosol
B)Citric acid cycle
C)Pyruvate
D)Acetyl coenzyme A
E)NAD
F)Mitochondria
G)Lactate
H)Electron transport system
I)Anaerobic
J)Glycolysis

Question

Quizplus · Accepted Answer

The first step in cellular respiration is glycolysis, which breaks down glucose into two pyruvate molecules.

Answer: I
 Anaerobic means without oxygen, and can refer to the type of cellular respiration that occurs when oxygen is not present, such as with fermentation.

Answer: C
 Pyruvate is the end product of glycolysis, and enters the mitochondria for further processing in the citric acid cycle.

Answer: D
 Acetyl coenzyme A is formed when pyruvate is converted in a series of reactions before entering the citric acid cycle.

Answer: E
 NAD, or nicotinamide adenine dinucleotide, is a coenzyme that acts as an electron carrier in cellular respiration.

Answer: F
 Mitochondria are the organelles where cellular respiration occurs.

Answer: G
 Lactate is a byproduct of anaerobic respiration, which can occur when oxygen is not present and the electron transport system cannot function.

Answer: H
 The electron transport system is the final step in cellular respiration, where electrons are passed down a chain of molecules to generate energy in the form of ATP.

Match Each Term with Its Description