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| An optical instrument with lenses that refract (bend) visible light to magnify images of specimens. | ||
| A membrane-enclosed sac of hydrolytic enzymes found in the cytoplasm of eukaryotic cells. | ||
| A solid rod of actin protein in the cytoplasm of almost all eukaryotic cells, making up part of the cytoskeleton and acting alone or with myosin to cause cell contraction. | ||
| A hollow rod of tubulin protein in the cytoplasm of all eukaryotic cells and in cilia, flagella, and the cytoskeleton. | ||
| A thin layer of adhesive extracellular material, primarily pectins, found between the primary walls of adjacent young plant cells. | ||
| The compartment of the mitochondrion enclosed by the inner membrane and containing enzymes and substrates for the Krebs cycle. | ||
| (plural, mitochondria) An organelle in eukaryotic cells that serves as the site of cellular respiration. | ||
| A type of protein filament that interacts with actin filaments to cause cell contraction. | ||
| The membrane in eukaryotes that encloses the nucleus, separating it from the cytoplasm. | ||
| A netlike array of protein filaments that maintains the shape of the nucleus. | ||
| A dense region of DNA in a prokaryotic cell. | ||
| (plural, nucleoli) A specialized structure in the nucleus, formed from various chromosomes and active in the synthesis of ribosomes. | ||
| (1) An atom's central core, containing protons and neutrons. (2) The chromosome-containing organelle of a eukaryotic cell. (3) A cluster of neurons. | ||
| One of several formed bodies with specialized functions, suspended in the cytoplasm of eukaryotic cells. | ||
| A microbody containing enzymes that transfer hydrogen from various substrates to oxygen, producing and then degrading hydrogen peroxide. | ||
| A type of endocytosis involving large, particulate substances, accomplished mainly by macrophages, neutrophils, and dendritic cells. | ||
| The membrane at the boundary of every cell that acts as a selective barrier, thereby regulating the cell's chemical composition. | ||
| (plural, plasmodesmata) An open channel in the cell wall of a plant through which strands of cytosol connect from an adjacent cell. | ||
| One of a family of closely related plant organelles that includes chloroplasts, chromoplasts, and amyloplasts (leucoplasts). | ||
| A relatively thin and flexible layer first secreted by a young plant cell. | ||
| A type of cell lacking a membrane-enclosed nucleus and membrane-enclosed organelles. Organisms with prokaryotic cells (bacteria and archaea) are called prokaryotes. | ||
| A glycoprotein in the extracellular matrix of animal cells, rich in carbohydrate. | ||
| (plural, pseudopodia) A cellular extension of amoeboid cells used in moving and feeding. | ||
| A cell organelle constructed in the nucleolus and functioning as the site of protein synthesis in the cytoplasm; consists of rRNA and protein molecules, which make up two subunits. | ||
| That portion of the endoplasmic reticulum studded with ribosomes. | ||
| A microscope that uses an electron beam to scan the surface of a sample to study details of its topography. | ||
| A strong and durable matrix often deposited in several laminated layers for plant cell protection and support. | ||
| That portion of the endoplasmic reticulum that is free of ribosomes. | ||
| The fluid of the chloroplast surrounding the thylakoid membrane; involved in the synthesis of organic molecules from carbon dioxide and water. | ||
| A flattened membrane sac inside the chloroplast, used to convert light energy to chemical energy. | ||
| A type of intercellular junction in animal cells that prevents the leakage of material between cells. | ||
| A membrane that encloses the central vacuole in a plant cell, separating the cytosol from the vacuolar contents, called cell sap; also known as the vacuolar membrane. | ||
| A microscope that passes an electron beam through very thin sections; primarily used to study the internal ultrastructure of cells. | ||
| A tiny membranous sac in a cell's cytoplasm carrying molecules produced by the cell. | ||
| A sac made of membrane inside of cells. |
