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The channels in cell membranes that help substances to move in and out of cells during active transport are made of A. protein. B. chlorophyll. C. cytoplasm D. carbohydrates.
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The channels in cell membranes that help substances to move in and out

of cells during active transport are made of
A. protein.
B. chlorophyll.
C. cytoplasm
D. carbohydrates.

User Serge Belov
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1 Answer

2 votes

Answer: proteins

Step-by-step explanation:

User Jeff Sheets
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