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Which of the following is the primary energy carrier for cells?


A line of mutated yeast cells, called Wee mutants, has no mitochondria. Their name comes from the fact that these cells are very small compared to other yeast cells. Which energy-harvesting processes can Wee mutants perform?

glycolysis and fermentation

At the end of glycolysis, the original carbons of the glucose molecule form:

two molecules of pyruvate.

How many of the carbons originally present in glucose continue to other reactions after glycolysis?

Six carbons are left in pyruvate molecules.

The end product of glycolysis is:

two pyruvate molecules.

The products of glycolysis are:

ATP, NADH, and pyruvate.

Glucose >> pyruvate


The citric acid cycle transfers electrons to


Oxygen is the final electron acceptor of

cellular respiration.

Cellular respiration equation

1 glucose + 6 O2 >> 6CO2 + 6H2O + ATP

Stages of cellular respiration

glycolysis, citric acid cycle, electron transport

Fuel for cellular respiration


Which energy-rich molecule produced by cellular respiration directly powers cell work?


Where are the low-energy electrons located after the electron transport chain is completed?

They are located in the bonds of H2O.

Which of the following occurs immediately after a cell runs out of oxygen?

The electron transport chain stops.

Glycolysis and the Krebs cycle reactions occur in the mitochondria. True or False?


During cellular respiration, the pyruvate produced in glycolysis is:

the source of electrons for NADH and FADH2.

During which step of aerobic respiration is oxygen used?

electron transport system

We breathe more heavily during exercise because our cells:

are producing more CO2.

The metabolic breakdown of one molecule of glucose generates the greatest amount of energy during:

electron transport.

How many CO2 molecules are generated from each pyruvate that enters the mitochondria?


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