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Unit 4
AP Biology Unit 4 Vocabulary- Salviejo-Camacho
| Term | Definition |
|---|---|
| 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. |