Which statement best describes what ultimately happens to the chemical energy that is not converted to new biomass in the process of energy transfer between trophic levels in an ecosystem?
A) It is undigested and winds up in the feces and is not passed on to higher trophic levels.
B) It is used by organisms to maintain their life processes through the reactions of cellular respiration.
C) Heat produced by cellular respiration is used by heterotrophs for thermoregulation.
D) It is eliminated as feces or is dissipated into space as heat, consistent with the second law of thermodynamics.
E) It is recycled by decomposers to smaller and smaller forms until it finally breaks down to form soil.
Answer: D
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What would happen if the G-protein coupled receptor in heart cells that binds to ACh had a mutation that caused it to bind more tightly to the G-protein alpha subunit?
A. G-protein activation and K+ channel opening would happen more quickly. Heart rate may remain abnormally low, impairing response to stress. B. This would lead to K+ flow out of heart cells, causing increased hyperpolarization. C. G-protein activation and K+ channel opening would be slowed. Heart rate may remain abnormally high, especially following stress. D. This would lead to K+ flow into heart cells, causing increased depolarization. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content/Choose Answer · What do you already know about G-proteins? What other information is related to the question? 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 DNA of an organism is studied and found to contain 14% guanine. This organism should have
____% thymine and ____% cytosine in its DNA.
a. 86; 14 b. 14; 36 c. 36; 36 d. 14; 86 e. 36; 14
Which of the following does not use a swim bladder to regulate buoyancy?
a. mackerel b. sea bass c. grouper d. sheepshead e. butterfly fish
Growth of an organism and maintenance of the body are the main roles of meiosis
a. true b. false