Jackson High School, Jackson

SCIENCE AP Biology

1. Dimensions for cells of various shapes are provided in the table below. Using this information,
rank the cells in order from fastest to slowest at procuring nutrients by diffusion from the
surrounding medium. Explain your reasoning. (6 points)
Cell shape Cell dimensions
Sphere Diameter = 3 μm
Cube Length = 2 μm
Width = 2 μm
Depth = 2 μm
● volume of a sphere = 4⁄3 r3
● volume of a cube of dimensions a × a × a = a3
● surface area of a sphere = 4 r2
● surface area of a cube of dimensions a × a × a = 6a2
1. Sphere
2. Cube
The sphere is the fastest because it has the highest surface area and the cube has the lowest.
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2. Draw an illustration of a cell showing the direction of movement in or out of the cell for the
following molecules: O2, CO2, urea, glucose, phosphate. How are the molecules taken up by the
cell used once inside the cell interior? (4 points)
Enzymes bind them to in