Author: DavidG@VeritasPrep
Posted: Fri Oct 13, 2017 10:33 am (GMT -8)
The point of the passage is to explain how a plant's regulatory system produces these discrete structures. We learn in the final paragraph the system works as follows: hormones --> enzymes ---> oligosaccharins --> specific effect on target structures. In other words, the oligosaccharins are the answer to the question of who allows cells to differentiate into structures such as roots. The answer is A
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Posted: Fri Oct 13, 2017 10:33 am (GMT -8)
Quote:
The second and third sentences of the first paragraph: How then can these cells differentiate and form structures as different as roots, stems, leaves, and fruits? The answer is that only a small subset of the genes in a particular kind of cell are expressed, or turned on, at a given time. 130. The passage suggests that which of the following is a function likely to be performed by an oligosaccharin?
(A) to stimulate a particular plant cell to become part of a plant's root system
(B) to stimulate the walls of a particular cell to produce other oligosaccharins
(C) to activate enzymes that release specific chemical messengers from plant cell walls
(D) to duplicate the gene complement in a particular plant cell
(E) to produce multiple effects on a particular subsystem of plant cells
(A) to stimulate a particular plant cell to become part of a plant's root system
(B) to stimulate the walls of a particular cell to produce other oligosaccharins
(C) to activate enzymes that release specific chemical messengers from plant cell walls
(D) to duplicate the gene complement in a particular plant cell
(E) to produce multiple effects on a particular subsystem of plant cells
The point of the passage is to explain how a plant's regulatory system produces these discrete structures. We learn in the final paragraph the system works as follows: hormones --> enzymes ---> oligosaccharins --> specific effect on target structures. In other words, the oligosaccharins are the answer to the question of who allows cells to differentiate into structures such as roots. The answer is A
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