The movement of water across the plasma membrane can be described by all of the following EXCEPT ________.
A) carrier-mediated facilitated diffusion.
B) passive membrane transport.
C) simple diffusion.
D) facilitated diffusion through aquaporins.
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Question 2) The lungs deliver a regular supply of oxygen to the blood, which is in turn circulated to most all the cells of the body. At the same time oxygen is consumed during aerobic cellular respiration within these cells. This implies that ________.
A) oxygen will passively diffuse into the cells
B) oxygen requires active transport to enter most cells
C) the concentration gradient for oxygen is steepness inside of the cell
D) the rate of oxygen diffusion is independent of concentration
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Question 3) Which of the following will NOT speed up the net rate of diffusion for glucose into a cell?
A) Decreasing the number of phospholipids in the plasma membrane
B) Increasing the concentration of glucose outside of the cell.
C) Increasing the number of glucose transport proteins within the plasma membrane.
D) Decreasing the concentration of glucose within the cell.
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Question 4) The myocardium (cardiac muscle tissue) undergoes a significant amount of physical stress due to its contractions. You would expect to see relatively large numbers of which of the following embedded within their plasma membrane?
A) tight junctions
B) desmosomes
C) glycolipids
D) transport proteins
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Question 5) Cancerous cells can divide so rapidly that they will often produce a glycocalyx that is different than the other cells in the body. This may result in ________.
A) allowing the cancer cells to bind to their healthy, neighboring cells
B) a decrease in the permeability of the tumor cell's plasma membrane preventing the uptake of chemotherapy drugs
C) the cancer cells conserving energy for more growth
D) cells of the immune system recognizing the tumorous cells as foreign and destroying them
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Question 6) If a human cell were to increase the amount of cholesterol embedded within its plasma membrane which of the following would most likely happen?
A) The plasma membrane would become more permeable to ions and less permeable to lipids.
B) The cell would form a plaque that could potential block a blood vessel.
C) The plasma membrane would become more fluid and the phospholipids less stable.
D) The plasma membrane would become more stable, less fluid and less permeable.
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Question 7) Bone is a connective tissue that provides support for the body with its strength and rigidity. Which of the following provides the best explanation for how this is so?
A) Bone cells are very dense and therefore resist physical stress.
B) Bones cells secrete an extracellular matrix that when combined with minerals becomes rock hard.
C) Bone cells have extensive cytoskeleton that makes them ridged.
D) The bone cell's plasma membrane contains a high degree of cholesterol that stabilizes the cell membrane, giving it strength.
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Question 8) Lipid rafts, found in the cell outer membrane surface, are concentrating platforms for certain receptor molecules or for protein molecules needed for cell signaling.
Indicate whether the statement is true or false
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Question 9) Enzymes and proteins needed for cell division are synthesizes and put into place during G2 phase.
Indicate whether the statement is true or false
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Question 10) DNA transcription is another word for DNA replication.
Indicate whether the statement is true or false
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