What is the difference between facilitated diffusion and active transport?
A. Facilitated diffusion is passive and active transport requires energy.
B. Facilitated diffusion requires energy and active transport is passive.
C. Both facilitated diffusion and active transport require energy.
D. Both facilitated diffusion and active transport do not require energy.
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Which of the following would likely move through the lipid bilayer of a plasma membrane more rapidly?
A. cholesterols
B. glucose
Ca+2
D. O2
An animal cell missing glycoproteins on the external surface of its plasma membrane would likely be impared in which function?
A. transporting various ions into the cell
B. cell-cell recognition
C. aiding in enzyme activity
D. attaching to the cytoskeleton
Winter vegetables like spinach and cabbage can maintain membrane fluidity...
A. by increasing number of unsaturated phospholipids in the membrane.
B. by increasing number of cholesterol molecules in the membrane.
C. by increasing number of saturated phospholipids in the membrane.
D. by changing the proteins of the membrane.
The cell theory was developed over time by different scientists. Which of these statements is not part of the current cell theory?
A. Cells arise only from existing cells.
B. The cell is the unit of all living things.
C. All cells are surrounded by a membrane.
D. All living organisms are composed of cells.
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