Chapter 8 Practice Problems
Cellular respiration
Cellular respiration is the process by which cells obtain ________________ by breaking down nutrients. This breakdown is accomplished by intake of ______________ and release of carbon dioxide. Cellular respiration involves the complete breakdown of glucose to carbon dioxide and water. Glucose breakdown is completed in the mitochondria of the cell. This breakdown is done through a series of ___________reactions. The breakdown results in production of the high-energy molecule ATP
A single "turn" of the Krebs cycle involves three different decarboxylation reactions.
False
The citric acid cycle is responsible for producing the bulk of the ATP generated during cellular respiration.
False
The energy that is released when hydrogen ions pass through ATP synthase provides the energy needed to form ADP and phosphate from ATP.
False
The overall goal of the electron transport chain is to break down glucose molecules into pyruvate, producing 2 ATP molecules.
False
The reactions that make up cellular respiration occur entirely within the mitochondria of cells.
False
The terminal electron acceptor in the electron transport chain is water.
False
Under aerobic conditions, the end-product of glycolysis is further reduced to yield more ATP.
Fasle
The electrons that are transferred through the electron transport system initially belonged to
NADH and FADH2.
As the hydrogen ions move down their concentration gradient, energy is released.
True
NADH serves as an electron carrier that can donate its hydrogen to other molecules.
True
The Krebs cycle occurs in the mitochondrion.
True
The NADH and FADH2 molecules that are used during the reactions of the electron transport chain are derived from glycolysis, the preparatory reactions, and the citric acid cycle.
True
When oxygen accepts electrons, water is produced as a by-product.
True
Whenever a molecule is oxidized, another molecule must be reduced.
True
Proton pumps are protein complexes that
move hydrogen ions across cell membranes.
