What Determines Polarity? Atoms forming compounds form ionic or covalent bonds. A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are made up of atoms that are held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge.. Polarity is a description of how different the electrical poles of a molecule are. A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. (physics and chemistry) The smallest unit of an element or compound, made up of two or more atoms held together by strong chemical bond. These bonds form as a result of the sharing or exchange of electrons among atoms. Amphipathic is an adjective describing a molecule which has both polar and nonpolar regions. Molecule Jump to: navigation, search For the scientific journal, see Molecules (journal). n. The branch of biology that deals with the structure, function, and manipulation of nucleic acids and proteins. There are mostly covalent bonds between the atoms of the molecules. Hydrogen gas (or H 2 ) is a small molecule … molecular biology synonyms, molecular biology pronunciation, molecular biology translation, English dictionary definition of molecular biology. Molecule: A compound is a group of atoms of different elements held together by chemical bonds. Molecule Definition A molecule is two or more atoms bonded together to form a single chemical entity. A molecule is a group of two or more similar or dissimilar atoms that are held together by chemical bonds. In quantum physics, organic chemistry, and biochemistry, the distinction from ions is dropped and molecule is often used when referring to polyatomic ions.. molecular biologist n. The field of molecular biology involves many other areas of biology such as biochemistry and genetics. Polar Molecule Definition. It is comprehensive, thorough, clear, and accurate’ - TIBSThe Oxford Dictionary of Biochemistry and Molecular Biology provides a comprehensive survey of modern biochemistry and molecular biology. A polar molecule is a chemical species in which the distribution of electrons between the covalently bonded atoms is not even. Molecular biology: The study of biology on a molecular level including the structure, function, and makeup of biologically important molecules such as DNA, RNA, and proteins. Amphipathic Definition. If a substance has molecular weight M, then M grams of the substance is termed one mole. Some chemical species, such as chains … Molecule definition is - the smallest particle of a substance that retains all the properties of the substance and is composed of one or more atoms. In the kinetic theory of gases, the term molecule is … The number of molecules in one mole is the same for all substances; this number is known as Avogadro’s number (6.022140857 × 10 23). Define molecular biology. The molecular weight of a molecule is the sum of the atomic weights of its component atoms. If they are highly different, it can be said that the species is a highly polar molecule. Definition noun, plural: molecules A tiny or a very small piece (of something). The number of atoms and types of atoms that bond together to form a molecule determine the size and shape of the molecule. You can predict whether a molecule will be polar or nonpolar by looking at the type of chemical bonds formed between the atoms of the elements. The atoms of certain elements readily bond with other atoms to form molecules. Fully revised and updated, this new edition includes definitions of terms from the fields of Bioinformatics, Biophysics, Cell Biology, Chemistry… In other words, the electrons will spend more time … Supplement How to use molecule in a sentence. ‘the book is almost an encyclopedia. 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