Which of the following statements is false?
a. The plasma membrane is more like a fluid than a
solid.
b. The cell membrane is symmetrical, so it is
impossible to identify which is the extracellular
surface.
c. Calcium pumps move calcium ions across the
membrane.
d. In a plasma membrane, proteins shift positions
and phospholipids flex their tails.
e. There are functional differences between the two
sides of the plasma membranes.
Answer: b
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List the four types of gymnosperms. What characteristics do they have in common? What sets each group apart?
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The nonsulfur photosynthetic bacteria use organic compounds as
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