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chapter 4 vocab MISS KING


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Cell membrane
The lipid bilayer that forms the outer boundary of a cell
A short, hairlike organelle that extends from a cell and functions in locomotion or in the movement of substances across the cell surface
In a eukaryotic cell, the organelle that contains most of the DNA and directs most of the cell's activities
A fluid-filled organelle that stores enzymes or metabolic wastes in a plant cell
A plastid containing chlorophyll; the site of photosynthesis
A cell that contains a nucleus and membrane-bound organelles
Peripheral protein
A protein attached to the interior or external surface of the cell membrane
Rough endoplasmic reticulum
The portion of the endoplasmic reticulum that contains attached ribosomes
Fluid mosaic model
A model of cell membrane structure representing the dynamic nature of membrane lipids and proteins
A flattened, membranous sac inside a chloroplast; contains most of the components involved in the light reactions of photosynthesis
Cell theory
The theory that all living things are made up of cells, that cells are the basic units of organisms, and that cells come only from existing cells
One of several formed bodies with a specialized function that is suspended in the cytoplasm and found in eukaryotic cells
in a eukaryotic cell, the organelle that contains most of the DNA and directs most of the cell's activities
DNA and protein in a coiled, rod-shaped form that occurs during cell division
The region of a cell between the cell membrane and the nucleus
The gelatin-like aqueous fluid that bathes the organelles on the inside of the cell membrane
Nuclear envelope
A double membrane that surrounds the nucleus of a eukaryotic cell
Endoplasmic reticulum
A system of membranous tubules and sacs in eukaryotic cells that functions as a path along which molecules move from one part of the cell to another
A membrane-bound structure that is the basic unit of life
The organelle that is the site of aerobic respiration in eukaryotic cells
An organelle of plant cells that contains starch, fats, or pigments
Nuclear pore
A small hole in the nuclear envelope through which substances pass between the nucleus and the cytoplasm
Smooth endoplasmic reticulum
The portion of the endoplasmic reticulum that lacks attached ribosomes
A polymer chain of the protein actin; the smallest strand in the cytoskeleton
A unicellular organism that lacks a nucleus and membrane-bound organelles
A hollow tube of protein that constitutes the largest strand in the cytoskeleton
Nuclear matrix
The nuclear skeleton, a shape-maintaining protein
One of two protein filaments in a muscle cell that function in contraction
Spindle fiber
One of the microtubules that extend across a dividing eukaryotic cell; assists in the movement of chromosomes
Golgi apparatus
A system of membranes in eukaryotic cells that modifies proteins for export by the cell
A hair-like structure made up of microtubules that function in locomotion
An organelle that functions in the synthesis of proteins
An organelle containing digestive enzymes, existing primarily in animal cells
The DNA and proteins in the nucleus of a nondividing cell
Integral protein
A protein imbedded in the bilayer of the cell membrane
Selectively permeable membrane
A membrane that keeps out some molecules but allows others to pass through
A fold of the inner membrane of mitochondria
A network of long protein strands in the Cytosol that helps maintain the shape and size of a eukaryotic cell
Cell wall
A rigid structure that surrounds the cells of plants, fungi, many protests, and most bacteria

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