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Nucha

Noun, pl. nuchae 1. The nape or back of the neck. (wiktionary.org) 2. The back or upper part of the neck. (biology-online.org) Syn: nape, scruff Word origin: Medical Latin, from nucha “spinal cord” (c.1400), from Medieval Latin nucha, from Arabic nukha “spinal...

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Nucleic Acid

/n(y)o͞oˈklē-ik/  Noun, pl. nucleic acids 1. A complex organic substance present in living cells, especially DNA or RNA, whose molecules consist of many nucleotides linked in a long chain. (Google Dictionary) 2. Any of the group of complex compounds consisting of linear chains of monomeric nucleotides whereby each monomeric unit is composed of phosphoric acid, sugar and nitrogenous base, and involved in the preservation, replication, and expression of hereditary information in every living cell.(www.biology-online.org) 3. (Biochemistry, Genetics) Any acidic, chainlike biological macromolecule consisting of multiply repeat units of phosphoric acid, sugar and purine and pyrimidine bases; they are involved in the preservation, replication and expression of hereditary information in every living cell. (Wiktionary.org) 4. Nucleic acids are large biological molecules essential for all known forms of life. They include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Together with proteins, nucleic acids are the most important biological macromolecules; each is found in abundance in all living things, where they function in encoding, transmitting and expressing genetic information....

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Nucleus

/ˈn(y)o͞oklēəs/ Noun, pl. nuclei 1. The core, central part (of something), round which others are assembled. (wiktionary.org) 2. An initial part or version that will receive additions. (wiktionary.org) 3. This collection will form the nucleus of a new library. (wiktionary.org) (Chemistry, physics) 1. The massive, positively charged central part of an atom, made up of protons and neutrons. (wiktionary.org); 2. A characteristic and stable complex of atoms or groups in a molecule (merriam-webster.com). 3. The positively charged central portion of an atom that comprises nearly all of the atomic mass and that consists of protons and neutrons except in hydrogen which consists of one proton only (merriam-webster.com). (Cytology) 1. A large organelle found in cells which contains genetic material (wiktionary.org). 2. Cell nucleus; a spheroid body within a cell, consisting of a thin nuclear membrane, organelles, one or more nucleoli, chromatin, linin, and nucleoplasm (medical-dictionary.thefreedictionary.com). 3. A cellular organelle of eukaryotes that is essential to cell functions (as reproduction and protein synthesis), is composed of nuclear sap and a nucleoprotein-rich network from which chromosomes and nucleoli arise, and is enclosed in a definite membrane (merriam-webster.com) (Neuroanatomy) 1. A ganglion, cluster of many neuronal bodies where synapsing occurs (wiktionary.org). 2. A group of nerve cells, usually within the central nervous system, bearing a direct relationship to the fibers of a particular nerve (medical-dictionary.thefreedictionary.com). 3. A mass of gray matter or...

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Struggling in Biology?

Are You Premed?

Confused about the MCAT? Not sure how to prepare? This guide will show you how