1 study - Study Guide 1 1 Anatomy branch of science that...

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Study Guide 1 1. Anatomy: branch of science that studies the physical structure of animals, plants, and other organisms 2. Physiology: branch of biology that deals with the internal workings of living things, including functions such as metabolism, respiration, and reproduction, rather than with their shape or structure 4. Atomic weight: = relative atomic mass 5. Elements: substance that cannot be broken down into substances w/ different properties; composed of only one type of atom 6. -Protons: + charge; located in nuclei -Neutrons: charge; located in nuclei -Electrons: - charge; located outside nuclei 7. Isotopes: each of two or more forms of a chemical element with the same atomic number but a different atomic mass due to the #s of neutrons 8. Bonds: - Covalent : atoms share 1 pair of electrons - hydrogen : weak bond that arises b/w a slightly + hydrogen atom of one molecule & a slightly – atom of another, or b/w parts of the same molecule - ionic : ions attached by opposing charges - peptide : type of covalent bond that joins 2 amino acids 9. –Acid: molecules tending to raise the hydro. Ion concen. in a solution & to lower its pH numerically - Bases: molecules tending to lower the hydrogen ion concen. in a solution & raise the pH numerically 10. Organic molecules: type of mol that contains carbon & hydrogen- and often contains oxygen also 11. -pH scale: measurement scale for hydrogen ion concentration
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-Buffer: substance or group of substances that tend to resist pH changes of a solution, thus stabilizing its relative acidity & basicity 12. -Diffusion: scattering of molecules/ions from regions of higher to regions of lower concentration Ex. Coffee & sugar
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