Question

score 5/600
which of these can assist in the transport of molecules across a membrane?
enzymes
fats
carbohydrates
lipids
proteins
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Explanation:

Membrane proteins (e.g., channel proteins, carrier proteins) facilitate the transport of molecules across cell membranes. Enzymes catalyze reactions, fats/lipids form the membrane structure, and carbohydrates have cell recognition roles—none directly assist in transport like proteins.

Answer:

proteins