How do large polar and charged molecules cross biological membranes?
A) Large polar and charged molecules can't cross biological membranes.
B) Large polar and charged molecules cross biological membranes via diffusion through the hydrophilic core of the membrane.
C) Large polar and charged molecules must be hydrolyzed before they can cross a biological membrane.
D) Large polar and charged molecules cross biological membranes via transport proteins that form hydrophilic channels through the membrane.
E) Both A and C
Answer: D
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What will be an ideal response?
Jacob had just finished his lab work and went to the sink to wash his hands. He removed his watch, and added liquid soap to his hands. He then turned on the water and began to rub his hands together, lathering for 20 seconds and cleaning fronts and backs of hands, fingernails, and between his fingers. He then rinsed his hands in running water, dried his hands with paper towels, and used an additional paper towel to turn off the faucet. Which statement is correct?
Jacob wasted paper towels by using one to turn off the faucet. Jacob did everything correctly. Jacob should have washed his hands for at least a minute. Jacob should have wet his hands in running water before applying the soap.