activator definition biology
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activator activator - (biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription. 1  substance - the real physical matter of which a person or thing consists; DNA is the substance of our genes.
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Activase DRUG DESCRIPTION. Activase is a tissue plasminogen activator produced by recombinant DNA technology. It is a sterile, purified glycoprotein of 527 amino acids. It is synthesized using the complementary DNA (cDNA) for natural human tissue-type plasminogen activator obtained from a human melanoma cell line.
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Mediators (also transmitter substances), in biology, substances that transmit excitation from a nerve ending to a working organ and from one nerve cell to another. The presumption that the transmission of excitation is due to the formation of some sort of chemical compound dates from the beginning of the 20th century.
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- Next generation English dictionary that leverages Bing for accurate and natural lookup experiences. This add-in works in: Excel 2013 or later, Excel for iPad, Excel Online, Word 2013 or later, Word 2016 for Mac, Word for iPad.
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- antiporter. (cell and molecular biology). A channel protein that simultaneously or sequentially transports two different types of substrates across a cell membrane, one into the cell (for example sodium ion) and one out of the cell (for example calcium ion).ntiporter. (cell and molecular biology). A channel protein that simultaneously or sequentially transports two different types of substrates across a cell membrane, one into the cell (for example sodium ion) and one out of the cell (for example calcium ion).
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- 1 A promotor is the sequence of DNA where RNA polymerase attaches when a gene is to be transcribed. 2  An operator is a short sequence of DNA where an active repressor binds, preventing RNA polymerase from attaching to the promotor--transcription therefore does not occur.
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inhibitor Also called: inhibiter a person or thing that inhibits. 2. (Chemistry) Also called: anticatalyst a substance that retards or stops a chemical reaction. Compare catalyst. 3. (Biochemistry) biochem. a. a substance that inhibits the action of an enzyme.
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Free Online Dictionary Effector (biology) In biochemistry, an effector molecule is usually a small molecule that selectively binds to a protein and regulates its biological activity. In this manner, effector molecules act as ligands that can increase or decrease enzyme activity, gene expression, or cell signalling. Effector molecules can also directly regulate the activity of some mRNA molecules (riboswitches).
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- actuator - a mechanism that puts something into automatic action. computer science, computing - the branch of engineering science that studies (with the aid of computers) computable processes and structures.
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enzyme Definition of enzyme for English Language Learners. : a chemical substance in animals and plants that helps to cause natural processes (such as digestion)
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- noun, plural: chemoautotrophs. An organism (typically a bacterium or a protozoan) that obtains energy through chemical process, which is by the oxidation of electron donating molecules from the environment, rather than by photosynthesis. Chemotrophs obtain energy mainly from carbon dioxide and from other inorganic chemicals.
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- Receptor: 1. In cell biology, a structure on the surface of a cell (or inside a cell) that selectively receives and binds a specific substance. There are many receptors.
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- [ef-fek´ter] 1  1. an agent that mediates a specific effect, as an allosteric effector or an effector cell. 2  2. an organ that produces an effect, such as contraction or secretion, in response to nerve stimulation; see also receptor. 3  allosteric effector one that binds to an enzyme at a site other than the active site.
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Receptor (cell biology) In cell biology, receptors are special structures that can be found in cell membranes. These are made of protein molecules such as glycoproteins. Receptors bind (attach) to specialised molecules. If the receptor has this molecule, it is activated, but if it does not it is deactivated.
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enzyme enzyme. biological catalyst catalyst,substance that can cause a change in the rate of a chemical reaction without itself being consumed in the reaction; the changing of the reaction rate by use of a catalyst is called catalysis...... Click the link for more information.
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photoautotroph noun, Biology. 1. any organism that derives its energy for food synthesis from light and is capable of using carbon dioxide as its principal source of carbon. Origin of photoautotroph. 1945-1950.
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Gene Gene. Definition. noun, plural: genes. (cell and molecular biology). The fundamental, physical, and functional unit of heredity. Supplement. It is because a gene is a segment of DNA (on a specific site on a chromosome) that is responsible for the physical and inheritable characteristics or phenotype of an organism. It also specifies the structure of a protein, and an RNA molecule. A gene is formerly called a factor.
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Ask The Expert: Are Kettle Cooked Potato Chips Healthier Than Regular Chips? If you compare a bag of kettle chips to a bag of regular potato chips, they'll probably have nearly identical ingredient lists, and the same amount of fat, calories and carbohydrates. Once in your body, they'll be broken down into sugar, set off a surge of insulin and cause excess sugar to be stored as fat.he Answer: The difference between kettle chips and standard potato chips is the cooking process. Whereas your basic bagged chip is fried in a conveyer-belt-like continuous process, kettle chips have a pre-industrial pedigree. They're made in batches -- dunk a bunch, take them out, dunk a bunch more.
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- Enzymes /ˈɛnzaɪmz/ are macromolecular biological catalysts. Enzymes accelerate, or catalyze, chemical reactions. The molecules at the beginning of the process upon which enzymes may act are called substrates and the enzyme converts these into different molecules, called products.
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What is cultivation? A cultivator is a garden or farm implement used to break up the surface of the soil for aeration, weed control, and the conservation of moisture.
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Enzyme Biochemistry - What Enzymes Are and How They Work Definition of an Enzyme An enzyme is defined as a macromolecule that catalyzes a biochemical reaction. In this type of chemical reaction, the starting molecules are called substrates. The enzyme interacts with a substrate, converting it into a new product. Most enzymes are named by combining the name of the substrate with the -ase suffix (e.g., protease, urease).
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- If you know what a point mutation is, then the description of a SNP might sound similar. True, both are single-nucleotide differences in a DNA sequence, but SNPs should not be confused with disease-causing mutations.
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Inhibitors: Definition & Types In biochemistry, an enzyme is a protein catalyst for a chemical reaction. There are three kinds of reversible enzyme inhibitors: competitive inhibitors, uncompetitive inhibitors, and noncompetitive inhibitors, which are classified according to where they bind to the enzyme.
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- Definition of INDUCER. : one that induces; especially: a substance that is capable of activating the transcription of a gene by combining with and inactivating a genetic repressor.ADVERTISEMENT. one that induces; specifically: a substance that is capable of activating the transcription of a gene by combining with and inactivating a genetic repressor. Britannica.com: Encyclopedia article about inducer.
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- enzyme-any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions. active site-the part of an enzyme or antibody where the chemical reaction occurs.
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- Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Wikipedia. enzyme induction. The process by which a microbial cell synthesizes an enzyme in response to the presence of a substrate or of a substance closely related to a substrate in the medium.