Aerobic cyanobacteria carry out the reactions of nitrogen fixation in
A) akinetes.
B) endospores.
C) heterocysts.
D) chloroplasts.
E) lamellae.
C
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If the WER gene were expressed in every root epidermal cell, the plant would
A. greatly increase its absorptive capacity. B. strengthen its attachment to the soil. C. increase in the diameter of its roots. D. greatly reduce its water and nutrient uptake. E. greatly reduce its ability to exchange gases at the epidermal surface. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about the function of the WER gene in root epidermal cells of plants? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? 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?
Sharks differ from most other fish in that they lack ____
a. gill slits b. scales c. bone d. paired appendages e. teeth
Anaphase II is essentially the same as mitotic anaphase except that in anaphase II ________ and in mitotic anaphase ________
A) the cells are diploid... the cells are haploid B) chromosomes line up double file in the middle of the cell... chromosomes line up single file in the middle of the cell C) crossing over occurs... crossing over does not occur D) the cells are haploid and sister chromatids separate... the cells have the same number of chromosomes as the original cell and sister chromatids separate
According to one of the main hypotheses for the origin of life, what must have come first?
A. abiotic synthesis of organic monomers B. joining of small molecules to produce macromolecules C. packaging of molecules into pre-cells D. formation of replicating molecules that made inheritance possible