The growth process that allows cells to become specialized to carry out specific functions is:
a. cell division.
b. cell elongation.
c. cell differentiation.
d. primary growth.
e. secondary growth.
c
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One day during the summer you and some friends make ice cream using an electric ice cream maker. To get the ice cream to form, a mixture of salt and ice is packed around the ice cream maker. A few days later you notice a yellow circle of dead grass where the ice cream maker had been placed. You hypothesize that some of the salt and ice mixture spilled onto the grass and ___.
A. froze the grass B. was isosmotic to the grass cells causing the yellow circle of dead grass C. was hyperosmotic to the grass cells causing the yellow circle of dead grass D. was hypoosmotic to the grass cells causing the yellow circle of dead grass 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 know about osmotic concentration? 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?
____________________ junctions are like buttons on a shirt to hold cells together. Fill in the blank(s) with the appropriate word(s)
During the 1980s, wolves were reintroduced to Yellowstone National Park after decades of absence due to attempted extermination in the early part of the twentieth century
Within 20 years, not only had the wolf population increased, but there was also a dramatic increase in other species, such as aspen, cottonwood, and willow trees, beavers, warblers, insects, and fish. These changes in Yellowstone Park are examples of how important a(n) ________ can be to an ecosystem. A) keystone species B) competitor C) herbivore D) parasite
In vertebrates, the family of myogenic regulatory factors (MRFs) plays a major role in muscle development. This family consists of four related genes that have distinct but overlapping functions. This gene family is represented by only a single gene in Drosophila, called nautilus. You want to know whether nautilus plays a role like all of the MRFs put together, or more like one in particular. What is a quick and easy way to begin to address this question?
A. Use a DNA microarray to compare gene activation patterns between nautilus and the MRFs. B. Compare the proteome of a cell expressing nautilus to the those of cells expressing each of the MRFs in turn. C. Generate four transgenic Drosophila strains that express the MRFs in a mutant nautilus background. D. Compare the DNA and protein sequences of all the genes to determine if nautilus is more similar to one MRF than another.