Which of the following plant hormones was discovered in infected rice seedlings that grew extremely tall and slender with "foolish seedling disease"?
A. auxin
B. ethylene
C. cytokinin
D. gibberellins
E. abscisic acid
Answer: D
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You are studying a gene which, when mutant, causes oligodendrocytes to enwrap shorter sections of axon, so that nodes of Ranvier are more closely spaced. What is the likely effect on nerve impulses?
Nodes of Ranvier are the spaces between sections of axon enwrapped with myelin. Because myelin creates an insulating layer that prevents ion flow, the progress of the action potential "jumps" from node to node, thus speeding up transmission down the axon. A. They will travel faster. B. They will travel slower. C. They will increase in amplitude. D. They will decrease in amplitude. E. They will travel laterally across connected axons. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content/Choose Answer · What do you already know about nodes of Ranvier? How do they relate to nerve impulses? Consider Alternatives · What other information is related to the question? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following is associated with the citric acid cycle?
a. ATP synthase b. FADH 2 c. oxygen d. ADP
Which of the following does NOT happen when the
body has excess sodium? a. More sodium is excreted. b. More sodium is reabsorbed. c. Edema occurs. d. Blood pressure rises. e. Aldosterone secretion is inhibited.
Approximately how much does a mole of carbon atoms (each having an atomic weight of 12) weigh?
A.) 1g B.) 6 X 10^23 g C.) 12 daltons D.) 12g E.) 6 X 10^23 daltons