Science Step 7

Term Definition
organelles Tiny cell structures that carry out specific functions within the cell.
cell membrane Controls what materials can travel in and out of the cell.
nucleus The "brain" or "control center" of the cell, which directs all the cells activities. It is amde up of three parts.
nucleolus Where the ribosomes are made.
ribsome Where proteins for the cell are produced. They are made in the nucleolus.
mitochondria Converts food molecules to energy for the rest of the plant to use.
choroplast Capture energy from the sunlight and use it to produce food for the cell
lysosome Small, round structures containing chemicals that break down certain materials in the cell.
cell wall A protective outer covering that lies just outside the cell membrane of plant cells.
vesicle A bound sac in eukrayotic cells that stores or transports the products of metabolism in the cell and is sometimes the site for the breaking down of metabolic waste.
smooth endoplasmic reticulum Makes lipids and breaks down toxins.
rough endoplasmic reticulum Packages and delivers proteins. Has ribosomes on the outside of it.
nuclear membrane It is a double membrane the surrounds the nucleus.
cytoskeleton Gives support to cell, holds cell parts
nuclear envelope Holds nuclear material.
DNA "Instruction manual" for making proteins.
golgi apparatus Packages proteins, receives proteins, and sends them out.
centriole Aids in animal cell devision.
unicellular Consisting of a single cell.
multicellular Composed of many cells.
capsule A membranous sac.
animal cell A form of eukaryotic cell which make up many tissues in animals.
plant cell A cell that is a structural and functional unit of a plant.
bacteria cell A large group of typically unicellular microorganisms.
prokaryotic cell A cell lacking a true membrane-bound nucleus.
eukaryotic cell A cell with a true nucleus.
flagellum Slender cellular appendage.
central vacuole A small cavity in the cytoplasm of a cell, bound by a single membrane and containing water, food, or metabolic waste.
cell theory The theory that cells form the fundamental structural and functional units of all living organisms.