The circulatory system of a whale is considered an organ system because it is composed of different
a. cells.
b. tissues
c. organs
d. molecules
Ans: c. organs
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You work for a pharmaceutical company that designs small RNAs, used to control expression of disease genes . The primary focus area of your research should be
A. transcriptional repression. B. transcriptional activation. C. translational repression. D. translational activation. 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 small RNAs? 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?
In organisms, the ability to control osmosis depends on the properties of the plasma membranes of individual cells. Based on their ability to permit the free movement of water and some solutes, these membranes are best described as
(select all correct choices): A. impermeable. B. permeable. C. semipermeable. D. diffusible. E. impervious.
The first amino acid in a growing polypeptide chain is _____
a. methionine b. valine c. lysine d. phenylalanine e. glycine
The pair of traits that best illustrates convergent evolution is
A. a cartilage skeleton in a shark and a bone skeleton in a dolphin. B. an elephant's tusks and a beaver's teeth. C. a lizard's arm and a bird's wing. D. a dragonfly's wing and a butterfly's wing.