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Receptors and ligands Knowledge-Based Practice

Biology · Cell Communication & the Cell Cycle · Biology · Cell Communication

1 Biology practice questions on Receptors and ligands. Questions that assess core concepts and understanding.

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  1. 1.

    Steroid hormones, such as estrogen and testosterone, serve as signaling molecules in multicellular organisms. Which statement correctly describes how these ligands interact with their target cells?

    • A) They bind to cell-surface transmembrane receptors because their polar structure prevents them from traversing the phospholipid bilayer.
    • B) They enter the cell via receptor-mediated endocytosis and are broken down in lysosomes to release cyclic AMP into the cytosol.
    • C) They bind directly to ligand-gated ion channels on the plasma membrane to rapidly alter the electrical potential of the cell.
    • D) They diffuse across the plasma membrane to bind intracellular receptors, forming a complex that typically functions to regulate gene expression.

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