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Transcript
Glossary algae Nonflowering plants, usually aquatic, including seaweed and many green single-celled organisms. antiseptic Inhibiting the growth of bacteria or other pathogens. bacteria Types of microscopic organisms without nuclei, most of which are singlecelled. Excerpt from DSM Small Things and Microscopes Teacher’s Guide, © Copyright by Delta Education, a member of the School Specialty Family. Not for resale, redistribution, or use other than classroom use without further permission. cell The basic structural unit of living organisms, usually formed of cytoplasm bounded by a membrane, with genetic material contained within a nucleus. epithelial cell A cell from an animal’s skin or certain inner cavities, usually occurring in sheets bound together without connective tissue. eyepiece The lens or group of lenses closest to the eye in an optical instrument. focus To adjust a lens to produce a welldefined image. lens A transparent material with at least one curved surface. cell membrane The thin casing that surrounds the cell. magnifier A convex lens used to enlarge the apparent size of something viewed through it. cell wall The thick layer surrounding the cell membrane in most plants. nucleus A structure within a living cell that contains genetic material. chlorophyll The green pigment in some plant cells, such as those in leaves, that allows plants to photosynthesize, or make food from carbon dioxide and water in the presence of sunlight. protist A one-celled organism from the kingdom Protista, sometimes regarded as an intermediate form between plants and animals. colony A group of the same kind of microorganisms growing in a culture. root hairs Extended cells near the tip of a root that absorb water and minerals for the plant. compound microscope A microscope containing two or more different lenses mounted as a single unit. slide A thin piece of glass or plastic used to mount objects for examination under a microscope. crystal A substance with a regular pattern of atoms or molecules that form a solid with symmetrically arranged sides. stage The platform of a microscope on which objects are laid for examination. crystalline Formed from crystals. culture The process or result of growing bacteria in a prepared medium. cytoplasm The liquid-like material contained within a cell membrane and surrounding the nucleus. stomata Small openings in the skin of a leaf or stem of a plant, through which gases are exchanged. wet mount A microscope slide on which an object is held in place by a cover slip mounted with a drop of water. Small Things and Microscopes 89