Which of the following intermediary metabolites enters the Krebs Cycle and is formed, in part, by the removal of carbon from one molecule of pyruvate?
A. CO2
B. pyruvate
C. NADH
D. acetyl CoA
Answer: D. acetyl CoA
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Plants share a most recent common ancestor with what group of protists?
A. green algae B. red algae C. brown algae D. cyanobacteria E. dinoflagellates
Eating and digesting a candy bar for energy during a sports event is a good example of
a. catabolism. b. anabolism. c. converting kinetic energy into potential energy. d. metabolism. e. converting potential chemical energy into kinetic chemical energy.
Which of the following explains why a saturated fat and an unsaturated fat are different?
a. A saturated fat contains double bonds, while an unsaturated fat does not. b. An unsaturated fat contains double bonds, while a saturated fat does not. c. A saturated fat is liquid at room temperature, while an unsaturated fat is not. d. A saturated fat can be called an oil, while an unsaturated fat cannot.
According to the endosymbiont hypothesis, what cellular components originated from free-living bacterial cells?
a. mitochondria and nucleus b. nuclei and ribosomes c. chloroplasts and ribosomes d. chloroplasts and mitochondria e. endoplasmic reticulum and mitochondria