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43 Cards in this Set

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  • Back
a membrane-bound structure that is the basic unit of life
cell
the lipid bilayer that forms the outer boundary of a cell
cell membrane
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
cell theory
a cell that contains a nucleus and membrane-bound orgnaelles
eukaryote
in a eukaryotic cell, the organelle that contains most of the DNA and directs most of the cells activities
nucleus
one of several formed bodies with a specialized function that is suspended in the cytoplasm and found in eukaryotic cells
organelle
a unicellular organism that lacks a nuclues and membrane-bound organelles
prokaryote
one of the two protein filaments in a muscle cell that function in contraction
actin
a rigid structure that surrounds the cells of plants, fungi, many protists, and most bacteria
cell wall
a plastid containing chlorophyll; the site of photosynthesis
chloroplast
the DNA and proteins in the nucleus of a nondividing cell
chromatin
DNA and protein in a coiled, rod-shaped form that occurs during cell division
chromosome
a short, hairlike organelle that extends from a cell and functions in locomotion or in the movement of substances across the cell surface
cilium
a fold of the inner membrane of mitochondria
crista
the region of a cell between the cell membrane and the nucleus
cytoplasm
a network of long network strands in the cytosol that helps maintain the shape and size of a eukaryotic cell
cytoskeleton
the gelatin like aqueous fluid that bathes the organelles on the inside of the cell membrane
cytosol
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
endoplasmic reticulum
a hairlike structure made up of microtubules that function in locomotion
flagellum
a model of a cell membrane structure representing the dynamic nature of membrane lipids and proteins
fluid mosaic model
a system of membranes in eukaryotic celss that modifies proteins for export by the cell
golgi apparatus
a protein imbedded in the b ilayer of the cell membrane
integral protein
an organelle containing digestive enzymes; existing primarily in animal cells
lysosome
a polymer chain of the protein actin; the smallest strand in the cytoskeleton
microfilament
a hollow tube of protein that constitutes the largest strand in the cytoskeleton
microtubule
the organelle that is the site of aerobic respiration in eukaryotic cells
mitochondrion
a double membrane that surrounds the nucleus of a eukaryotic cell
nuclear envelope
the nuclear skeleton, a shape maintaining protein
nuclear matrix
a small hole in the nuclear envelope through which substances pass between the nucleus and the cytoplasm
nuclear pore
the structure in which ribosomes are synthesized and partially assembled; found in most nuclei
nucleolus
a protein attached to the interior or exterior surface of the cell membrane
peripheral protein
an organelle of plant cells that contains starch, fats, or pigments
plastid
an organelle that functions in the synthesis of proteins
ribosome
the portion of the endoplasmic reticulum that contains attached ribosomes
rough endoplasmic reticulum
a membrane that keeps out some molecules but allows others to pass through
selectively permeable membrane
the portion of the endoplasmic reticulum that lacks attached ribosomes
smooth endoplasmic reticulum
one of the microtubules that extend across a dividing eukaryotic cell; assists in the movement of chromosomes
spindle fiber
a flattened membranous sac inside a chloroplast; contains most of the components involved in the light reactions of photosynthesis
thylakoid
a fluid-filled organelle that stores enzymes or metabolic wastes in a plant cell
vacuole
a collection of genetically identical cells that live together in a closely connected group
colonial organism
several types of body tissues that together perform a function
organ
a group of organs that interact to perform a set of related tasks
organ system
in most multicellular organisms, a group of similar cells that carry out a common function
tissue