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For example, the virus that causes human influenza (flu) binds specifically to receptors on membranes of cells of the respiratory system. Chemical differences in the cell-surface receptors among hosts mean that a virus that infects a specific species (for example, humans) cannot infect another species (for example, chickens).
Dec 18, 2016 · Signaling begins with the recognition of a chemical messenger – a ligand – by a receptor protein in a target cell —. The ligand-binding domain of a receptor recognizes a specific chemical messenger, which can be a peptide, a small chemical, or protein, in a specific one-to-one relationship.
Dec 18, 2016 · Here, we cover the basics of the Endosymbiotic Theory and the Origin of Cell Compartmentalization - section 2.11 of the AP Biology curriculum.
Apr 1, 2024 · A receptor is a specialized protein molecule that selectively recognizes and binds to specific ligands, leading to cellular responses or signal transduction within the cell.
Jan 19, 2021 · Cell recognition is one of the ways by which cell s communicate with one another. It is possible through specific cellular adhesion molecule s on the surface of the cell. Examples are: Integrin (LFA-1) of T cell binding to ICAM of endothelial cell.
Download free-response questions from past AP Biology exams, along with scoring guidelines, sample responses from exam takers, and scoring distributions.
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Dec 18, 2016 · Though these pathways are very different, we’ll identify the common elements they utilize and see the cellular responses they elicit. Most importantly, we’ll see how these signal transduction pathways can lead to genetic responses that can literally change a cell’s phenotype or even lead to apoptosis (cell death).
