Multiple Choice
In the context of principles of transmembrane transport, which statement correctly describes the difference between simple diffusion and facilitated diffusion across a cell membrane?
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9. Transport Across Membranes
Principles of Transmembrane Transport
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In mammalian cells, how does cytosolic pyruvate enter the mitochondrial matrix for oxidation by the pyruvate dehydrogenase complex?
A
By vesicular endocytosis of pyruvate into the mitochondrial matrix
B
By simple diffusion through the inner mitochondrial membrane because pyruvate is nonpolar
C
By direct passage through the -ATP synthase channel as a coupled import mechanism
D
By transport across the inner mitochondrial membrane via the mitochondrial pyruvate carrier (MPC), a specific pyruvate transporter
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