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Chapter Test
Biology 2
Question | Answer |
---|---|
citric acid | product of acetyl CoA and oxaloacetic acid |
kilocalorie | unit of energy |
glycolysis | first pathway of cellular respiration |
aerobic respiration | cellular respiration in the presence of oxygen |
cell membrane | location of electron transport chain in prokaryotes |
cytosol | location of glycolysis |
NAD+ | electron acceptor |
fermentation | glycolysis and anaerobic pathways |
In aerobic respiration, glucose molecules are converted into acetyl CoA molecules when they enter | glycolysis |
Yeast cells produce alcohol and carbon dioxide in the process of | alcoholic fermentation |
In cellular respiration, glycolysis immediately precedes the | Krebs cycle. |
In cellular respiration, more energy is transferred in ________ than in any other step. | the electron transport chain |
________ donate electrons to the electron transport chain. | FADH2 and NADH |
The breakdown of organic compounds to produce ATP is known as | cellular respiration. |
Glycolysis begins with glucose and produces | pyruvic acid |
An important molecule generated by both lactic acid fermentation and alcoholic fermentation is | NAD+ |
In the first step of aerobic respiration, pyruvic acid from glycolysis produces CO2,NADH,H,and | acetyl CoA |
The electron transport chain is driven by two products of the Krebs cycle— | NADH and FADH2 |
What happens to electrons as they are transported along the electron transport chain? | They lose energy. |
The energy efficiency of cellular respiration is approximately | 66 percent |
In alcoholic fermentation, ethyl alcohol is produced from | pyruvic acid. |
The fourth step of glycolysis yields four ATP molecules, but the net yield from glycolysis is only two ATP molecules. Explain this discrepancy. | Two ATP molecules are used in step one. |
Under what conditions would cells in your body undergo lactic acid fermentation? | When muscle cells are involved in strenuous exercise and the body cannot supply them with oxygen rapidly enough to carry out aerobic respiration, lactic acid fermentation will occur. |
Glycolysis produces only 2% of the energy that would be produced if an equal quantity of glucose were completely oxidized. What has happened to the remaining energy in the glucose? | Much of the energy originally contained in glucose is held in pyruvic acid. |
Explain the role of oxaloacetic acid with respect to the cyclical nature of Krebs cycle. | Oxaloacetic acid regenerates coenzyme A when it reacts with acetyl CoA to form citric acid in step one of the Krebs cycle. Coenzyme A is needed to begin the Krebs cycle again |
What happens to electrons that accumulate at the end of the electron transport chain? | The electrons react with oxygen to form water |
Where in the mitochondrion do protons accumulate, and what is the source of the protons? | the mitochondrial matrix; NADH and FADH2 |