What is the general shape of antibodies?

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Multiple Choice

What is the general shape of antibodies?

Explanation:
Antibodies are Y-shaped molecules. They’re made from two identical heavy chains and two identical light chains connected by disulfide bonds, forming two arms and a flexible hinge. The tips of the two arms create the antigen-binding sites (Fab regions) that recognize specific epitopes, while the stem (the Fc region) helps interact with other parts of the immune system. This Y shape lets a single antibody bind two sites on antigens and adjust the angle between arms, aiding cross-linking and signaling. The other shapes don’t describe how antibodies are arranged in three dimensions—the molecule is inherently Y-shaped, not circular, linear, or S-shaped.

Antibodies are Y-shaped molecules. They’re made from two identical heavy chains and two identical light chains connected by disulfide bonds, forming two arms and a flexible hinge. The tips of the two arms create the antigen-binding sites (Fab regions) that recognize specific epitopes, while the stem (the Fc region) helps interact with other parts of the immune system. This Y shape lets a single antibody bind two sites on antigens and adjust the angle between arms, aiding cross-linking and signaling. The other shapes don’t describe how antibodies are arranged in three dimensions—the molecule is inherently Y-shaped, not circular, linear, or S-shaped.

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