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Outer Mitochondrial Membrane

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Questions and Answers

Which of the following is true about the outer mitochondrial membrane?

It does not contain any enzymes

It allows molecules of any size to freely diffuse

It is thicker than the eukaryotic plasma membrane

It contains integral membrane proteins called porins (correct)

What is the main function of the porins in the outer mitochondrial membrane?

To degrade tryptophan

To allow molecules of any size to freely diffuse (correct)

To actively move large proteins across the membrane

To elongate fatty acids

How do larger proteins enter the mitochondrion?

They freely diffuse through the outer mitochondrial membrane

They bind to translocase of the outer membrane

They actively move across the membrane through porins

They are transported by specialized translocate complexes (correct)

What is the protein-to-phospholipid ratio of the outer mitochondrial membrane?

The same as that of the eukaryotic plasma membrane Signup and view all the answers

Which of the following is NOT an activity of the enzymes in the outer mitochondrial membrane?

Import of mitochondrial pro-proteins Signup and view all the answers

Which G protein subunit stimulates adenylyl cyclase?

a subunit Signup and view all the answers

How many different β subunits do mammalian genomes encode?

5 Signup and view all the answers

What is the function of γ subunits in G proteins?

Regulate the activities of other target enzymes Signup and view all the answers

Which G protein is associated with the epinephrine receptor?

G5 Signup and view all the answers

How do different G proteins couple receptors to distinct intracellular targets?

By associating with different receptors Signup and view all the answers