Consider a living plant cell in a living leaf that has a higher water potential than the fluids surrounding the cell. In such
a situation there should be ____.
a. a net flow of water out of the cell
b. gain of water by the cell only if the cell's pressure potential is high enough
c. no net flow of water into or out of the cell
d. a net flow of water into the cell
e. gain of water by the cell only if the cell's pressure potential is low enough
ANSWER: a
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For living organisms, which of the following is an important consequence of the first law of thermodynamics?
A) The energy content of an organism is constant. B) The organism ultimately must obtain all of the necessary energy for life from its environment. C) The entropy of an organism decreases with time as the organism grows in complexity. D) Organisms grow by converting energy into organic matter. E) Life does not obey the first law of thermodynamics.
It is difficult to estimate when cyanobacteria appeared on Earth using evidence from the oxidation state of the Earth's crust, because
A) several abiotic reactions could have formed Fe3+. B) there are multiple forms of anoxygenic photosynthesis. C) there are multiple groups of oxygenic photosynthetic bacteria. D) several ancient anaerobic metabolisms form Fe3+.
Two proteins, Rag-1 and Rag-2, catalyze VDJ recombination. Where would you expect these proteins to be expressed?
A. thyroid and parathyroid B. bone marrow only C. bone marrow and thymus D. thyroid only E. blood serum 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 antibodies? 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?
Most of the protein eaten by the mother during the third trimester is used for the development of the
____________________ system. Fill in the blank(s) with the appropriate word(s).