Secondary succession occurs more quickly than primary succession mainly because ____.
A. improved soil is present from the start
B. disturbances in the community exposes more soil
C. rocky areas contain more minerals
D. sunlight is more available
E. nitrogen-fixing bacteria are present
Answer: A
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Which of the following statements is true regarding the bacteria present in the stomachs or intestines of humans?
A. Some stomach bacteria have been associated with cancers. B. Many intestinal bacteria aid in digestion. C. Intestinal bacteria can produce important vitamins. D. Intestinal bacteria may play a role in immune system function. E. All of these answer options are correct.
What antibody predominates during secondary antigen exposures?
A. IgA B. IgG C. IgE D. IgD E. IgM
What would result if too many cells left the surface of the embryo to move inside during gastruation?
A. Too little endoderm, resulting in missing gut and organs B. Too little ectoderm, resulting in missing nervous system or skin C. Problems in muscle development D. Too little protoderm, resulting in missing organs Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the fate of the surface cells? What other information is related to the question? Choose Answer Given what you now know, what information 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?
The finding that MSH (melanocyte-stimulating hormone) causes frog skin cells to darken when added to the interstitial fluid but has no effect on color when injected into the cells supports which of the following ideas?
a. MSH is a tropic hormone. b. MSH is a neurohormone. c. MSH binds to cell surface receptors. d. MSH is a steroid hormone. e. MSH is a steroid hormone and binds to cell surface receptors.