GRE Subject Test: Biochemistry, Cell, and Molecular Biology : Help with Junction Functions

Study concepts, example questions & explanations for GRE Subject Test: Biochemistry, Cell, and Molecular Biology

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All GRE Subject Test: Biochemistry, Cell, and Molecular Biology Resources

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Example Questions

Example Question #4 : Cellular Processes

What is the main purpose of gap junctions?

Possible Answers:

Prevents water from moving between cells

Allows molecules and ions to travel between cells

Allows large molecules to move between cells

Prevents cells from separating from one another

Correct answer:

Allows molecules and ions to travel between cells

Explanation:

Gap junctions can be thought of as small tunnels between cells. They allow for the immediate transport of ions and molecules between the cells. Gap junctions are prominent in cardiac myocytes, and help spread action potentials via electrical synapses to coordinate the contraction of the heart.

Example Question #5 : Cellular Processes

Which cellular junction will be most useful in preventing the movement of material between cell membranes?

Possible Answers:

Tight junctions

Desmosomes

Gap junctions

Hemidesmosomes

Correct answer:

Tight junctions

Explanation:

The movement of substances between cells is most commonly controlled by tight junctions. These junctions can be regulated, which can alter how strongly they resist the movement of material between cells, like those in the digestive tract during absorption.

All GRE Subject Test: Biochemistry, Cell, and Molecular Biology Resources

1 Diagnostic Test 201 Practice Tests Question of the Day Flashcards Learn by Concept
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