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Unit 4

AP Biology Unit 4 Vocabulary- Salviejo-Camacho

TermDefinition
Target Cell Any cell that has a specific receptor for an antigen or antibody or hormone or drug, or is the focus of contact by a virus or phagocyte or nerve fiber etc.
Ligand A molecule that binds specifically to another molecule, usually a larger one.
Phosphorylation A biochemical process that involves the addition of phosphate to an organic compound.
Receptor Protein Receptor proteins are proteins embedded in the cell membrane and are meant to recognize and bind to specific substances outside of the cell.
Secondary Messenger Second messengers are molecules that relay signals received at receptors on the cell surface and they serve to greatly amplify the strength of the signal.
Signal Amplification The amplification of signals, defined as an increase in the intensity of a signal through networks of intracellular reactions, is considered one of the essential properties in many cell signalling pathways.
Signal Transduction The linkage of a mechanical, chemical, or electromagnetic stimulus to a specific cellular response.
Response (1) In cellular communication, the change in a specific cellular activity brought about by a transduced signal from outside the cell. (2) In feedback regulation, a psychological activity triggered by a chance in a variable.
Feedback (inhibition) a method of metabolic control in which the end product of a metabolic pathway acts as an inhibitor of an enzyme within that pathway.
Negative Feedback A form of regulation in which accumulation of an end product of a process slows the process; in physiology, a primary mechanism of homeostasis, whereby a change in a variable triggers a response that counteracts the initial change.
Positive Feedback A form of regulation in which an end product of a process speeds up that process; in physiology, a control mechanism in which a change in a variable triggers a response that reinforces or amplifies the change.
Asexual Reproduction The generation of offspring from a single parent that occurs without the fusion of gametes. In most cases, the offspring are genetically identical to the parent.
Cell Cycle (control system) a cyclically operating set of molecules in the eukaryotic cell that both triggers and coordinates key events in the cell cycle.
Interphase The period in the cell cycle when the cell is not dividing. During interphase, cellular metabolic activity is high, chromosomes and organelles are duplicated, and cell size may increase.
Mitosis A process of nuclear division in eukaryotic cells conventionally divided into five stages: prophase, prometaphase, metaphase, anaphase, and telophase.
Cancer An abnormal growth of cells which tend to proliferate in an uncontrolled way and, in some cases, to metastasize (spread).
Cyclin A cellular protein that occurs in a cyclically fluctuating concentration and that plays an important role in regulating the cell cycle.
Created by: kaliamae
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