A small number of cell surface receptors can ultimately generate a large intracellular response due to activation of kinase cascades. This is referred to as:
A. signal amplification.
B. signal transduction.
C. signal dampening.
D. signal activation.
A. signal amplification.
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Overexpression of caudal in the early Drosophila embryo, at a level high enough to overcome inhibition by Bicoid protein, would
A. interfere with the development of anterior structures. B. interfere with the development of posterior structures. C. interfere with the development of both anterior and posterior structures. D. have no effect since the cytoplasm has already been determined. 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 caudal? Consider Possibilities · Consider the different answer options. Which can you rule out? 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?
The microscope that allows the specimen to appear three-dimensional is the
A. phase contrast microscope. B. interference microscope. C. fluorescence microscope. D. dark-field microscope.
Which structure is a covering for the gill chamber in ray-finned fishes?
a. swim bladder b. spiral valve c. operculum d. atrium e. lateral-line system
Convert 0.75 g to mg.
A. 75 B. 750 C. 7.5 D. 7500