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Michael Rotondo
chapter 4 vocab
33
Biology
9th Grade
11/26/2011

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Term
cell
Definition
the smallest unit that can preforn a life process
Term
cell theory
Definition
a therory that states all living thinmgs are made up of one or more cells
Term
plasma membrane
Definition
the cells outer membrane
Term
cytoplasm
Definition
the region of the cell withen the mebrane that incluids the fliud
Term
cytosol
Definition
the soluble portion of the cytoplasm
Term
nucleus
Definition
an atoms central region
Term
prokaryote
Definition
a single celled organism that has no nucleus and has no membrane bound or orgenelles
Term
eukaryote
Definition
organism made up of orgeneles that are made up of cells that have a nucleus enclosed by a membrane
Term
organelle
Definition
one of the small bodies that are found in the cytoplasm
Term
tissue
Definition
a collesction of specilized celss and cell products that preorm a sspecific cell function
Term
organ
Definition
a collection of tissue that cary out a soesilized function of the body
Term
organ system
Definition
a group of organs that accomplish related tasks
Term
phospholipid bilayer
Definition
a double layer of phosolipids that makes up a plasma and organelle membrane
Term
chromosome
Definition
one of the in the nucleus that are made up of dna and protien
Term
nuclear envelope
Definition
the double membrane that surrounds the nucleus of a eukaryotic cell
Term
nucleolus
Definition
the part of the eukaryotic nucleauds whereRNA is synthesized
Term
ribosome
Definition
a cell organelle composed of rna and protien
Term
mitochondrion
Definition
the cell organelle that is surronded by two membranes and that is the site of cellualr resperation
Term
endoplasmic reticulum
Definition
a system of membranes that is found in sa cells cytoplasym and that assists in thr productiomn
Term
Golgi apparatus
Definition
cell organelle that helps make and packega materials to be tranfered out of the cell
Term
lysosome
Definition
a organelle that contains digestive enzymes and that buds from the gogli apperatus
Term
cytoskeleton
Definition
the cytoplasmic network of protien filiments and tubes that plays an essential role in cell movement
Term
microtubule
Definition
one of the small tubular fibers composed of protiens tubulin thaty are found in cytoplasym of eukaryotic cells
Term
microfilament
Definition
a fiber found inside eukayotic cells that is composed mainly of the protien nactin and that has a role in cell structure and movement
Term
cilium
Definition
a hari like structure tightly packed rows that project from the surface of the cells
Term
flagellum
Definition
a strong hair like structute that grows out of a cell and enables the cell to move
Term
centriole
Definition
an organelle that is comosed of two short microtublus at right angles to eachother and that has an active role in mitosis
Term
cell wall
Definition
a rigid structure that surrounds the cell membrabe and provieds support to the cell
Term
central vacuole
Definition
a large fluid filled organelle that stores not only water but also enzymes, metabolic waste, and other materials
Term
plastid
Definition
organelles that, like mitochondrion, are surrounded by a double membrane and contain their own DNA
Term
chloroplast
Definition
a plastid in the cells of green plants that contains chlorophylls and create glucose through photosynthesis
Term
thylakoid
Definition
saclike membrane that contains chlorophyll
Term
chlorophyll
Definition
green pigment found in plants
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