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Question 1151
What is the rigid outer layer of plant cells called?
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Question 1152
Which process involves the use of vesicles to take in external materials?
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Question 1153
What kind of transport moves molecules from low to high concentration?
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Question 1154
Why can't polar molecules easily pass through the lipid bilayer?
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Question 1155
What term describes the movement of water across a selectively permeable membrane?