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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). However, viruses have very small amounts of DNA or RNA compared to humans, and, as a result, viral reproduction can occur rapidly.
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.
Dec 18, 2016 · Your endocrine system is constantly secreting hormones for many different purposes that cause a huge variety of reactions in different cell types around your body. Here, we cover the basics of the Endosymbiotic Theory and the Origin of Cell Compartmentalization - section 2.11 of the AP Biology curriculum.
AP Biology glossary of key terms with definitions, must-know facts, and related terms you need to know for your exam.
Dec 7, 2023 · Cell Recognition. Our bodies have several defence mechanisms against pathogens. These include: Preventing the entry of pathogens by a variety of physical and chemical defences, such as the skin, mucous membranes, tears (containing the enzyme lysozyme, which destroys bacteria) and saliva.
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 · 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.
