What are carrier proteins?
A) They are proteins that transport tRNA in the nucleolus.
B) They are proteins that transport mRNA in the nucleus.
C) They are the proteins that transfer molecules and ions across the plasma membrane
D) They are proteins that phosphorylate enzymes in the plasma membrane.
E) They are proteins that break down phospholipids in the plasma membrane.
IMAT 2024 · Question 15
Q15 - Membrane transport
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The correct answer is C) They are the proteins that transfer molecules and ions across the plasma membrane.
Carrier proteins sit in the membrane, bind a specific molecule or ion, change shape and move it across the membrane. Glucose transporters (facilitated diffusion) and the Na⁺/K⁺ pump (active transport) are the standard examples.
None of the other options describe a transport job.
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