Why is one side of a single water molecule partially negative while the other side is partially positive?
A. Electron pairs are unevenly shared between the oxygen atom and the two hydrogen atoms.
B. Electron pairs are unevenly shared between the two hydrogen atoms.
C. Hydrogen donates its electrons to oxygen.
D. Oxygen donates its electrons to hydrogen.
Answer: A
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If the age of the Earth is 4.6 billion years old, for what percentage of this time is Earth thought to have been anaerobic?
A. 0.1% B. 27% C. 44% D. 68% E. 99.3
Which of the following correctly lists the types of cellular communication from shortest to longest distance travelled by the signaling molecule to reach its responding cell?
A. paracrine, autocrine, endocrine B. autocrine, endocrine, paracrine C. autocrine, paracrine, endocrine D. endocrine, paracrine, autocrine
All the processes that lead to the death of a plant or
any of its organs are a. dormancy. b. vernalization. c. abscission. d. senescence. e. none of these.
What is the fate of the NADH and FADH2 made during the first stages of aerobic respiration?
A. They carry electrons to the electron transport chain. B. They carry electrons to water. C. They carry them to the Calvin cycle to reduce carbon dioxide. D. They carry electrons to acetylaldehyde producing ethanol or lactic acid. E. They carry electrons to the Krebs cycle.