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A scientist is comparing the outer structure of an onion cell, structure X, to the outer structure of a human skin cell, structure Y. Which generalization is true about the types of structures being examined?

A) Structure X is not living, and structure Y is living.
B) Structure X can be found in some human cells, and structure Y can be found in some plant cells.
C) Structure X is only found in plant cells, and structure Y is found in plant and animal cells.
D) Structure X is semipermeable, and structure Y is selectively permeable.

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oopsydaisy
Out of the choices given here, the generalization that is true about the types of structures being examined is that structure X is only found in plant cells, and structure Y is found in plant and animal cells. The correct answer will be C. 
Erudite1

The correct option is C.

The outer structure of an onion is made up of cellulose cell wall. Cellulose is a material that is found only in plant cells, it is not present in the animal cells. The plant cell wall is made up of cellulose; cellulose is a polysaccharide, which gives the cell wall its form and rigidity. Structure Y on the other hand, which is cell membrane is found in both plants and animals cells.

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