Which statement most likely describes the structures he has represented so far? James is making models of plant and animal cells using objects supplied by his teacher to represent organelles. For one cell, he will place the objects in a shoebox. First he fills a balloon with water and places it in the shoe box. He also drops a handful of marbles into the box.
Answer
A
He could be making either a plant or animal cell. The box is the cell wall, and the balloon represents the large vacuole. The marbles are the centrioles.
B
He is making an animal cell. The box is the cell membrane, and the balloon represents the large vacuole. The marbles are the endoplasmic reticulum.
C
He is making a plant cell. The box is the cell wall, and the balloon represents the large vacuole. The marbles are the tiny ribosomes.
D
He is making a plant cell. The box is the cell wall, and the balloon represents the nucleus. The marbles are the centrioles.
Explanation
A plant cell has a rigid cell wall, which the shoebox can represent. The water-filled balloon is a good model of the large vacuole, which stores water in plant cells. The tiny marbles can represent ribosomes, which are small structures found in cells. Choice D matches all three models; centrioles are not the best match for marbles in this model, and animal cells do not have a cell wall.
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