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

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 #1 : Cellular Junctions

Which of the following proteins forms channels that permit electrical communication between cells across gap junctions? 

Possible Answers:

Tubulin

Connexin

Catenin

Ephrin

Cadherin

Correct answer:

Connexin

Explanation:

Most of the other proteins listed are structural, but do not form any kind of pore or channel through which an electrical message can cross. Connexins are required for this function of gap junctions. 

Example Question #1 : Help With Junction Proteins

What are the two major proteins that comprise tight junctionscellular junctions that prevent fluids from traveling between cells and generally contribute to morphology by holding cells together?

Possible Answers:

Claudins and occludins

Occludins and connexins

Claudins and adherins 

Connexins and integrins

Claudins and protocadherins

Correct answer:

Claudins and occludins

Explanation:

While each of the proteins listed contribute to cell structure and function, the tight junction requires claudins and occludins to anchor the cytoskeleton of two adjacent cells to one another. These are the primary structural components of tight junctions. 

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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