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Plant & Animal Cell
Cell Biology
43
Biology
9th Grade
11/04/2012

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Term
What is the Cell Theory?
Definition
Three ideas 1) All organisms are made up of one or more cells. 2) The cell is the basic unit of structure and organization of organisms. 3) All cells come from pre-existing cells.
Term
Who developed the cell theory?
Definition
Three scientists developed the theory from their observations and conclusions.
Term
Organelle
Definition
Small specialized strutures found in all cells.
Term
Homeostatis
Definition
Is the process of maintaining balance in the cell.
Term
cell (plasma) membrane
Definition
the flexible boundary between cell and its environment
Term
selective permeability
Definition
is a process in which a membrane allows some molecules to pass through while keeping others out.
Term
nucleus
Definition
the central membrane bound organelle that manages or controls cellular function.
Term
electron microscope
Definition
uses a deam of electrons instead of light to magnify structures up to 500,000 times their actual size
Term
prokaryotes
Definition
are unicellular organisms, such as bacteria, that do not have membrane-bound organelles.
Term
eukaryotes
Definition
cells that contain membrane-bound organelles
Term
phospholipid
Definition
has a glycerol backbone, two fatty acid chains and a phosphate group.
Term
fluid mosaic model
Definition
Is the model of the plasma membrane
Term
transport proteins
Definition
move needed substances or waste materials though the plasma membrane.
Term
cell wall
Definition
is a fairly rigid structure located outside of plasma membrane.
Term
chromatin
Definition
are strands of the genetic material, DNA.
Term
nucleolus
Definition
is a prominent organelle within the nucleus that makes ribosomes.
Term
ribosomes
Definition
are the sites where the cell produces proteins according to the directions of the DNA.
Term
cytoplams
Definition
is the clear, gelatinous fluid inside of a cell.
Term
endoplasmic reticulum
Definition
is the site of cellular chemical reactions.
Term
Golgi apparatus
Definition
after proteins are made, they are transferred to this organelle.
Term
vacuoles
Definition
membrane-bound compartments in cells.
Term
lysosomes
Definition
are organelles that contain digestive enzymes.
Term
chloroplasts
Definition
are cell organelles that capture light energy and convert it to chemical energy.
Term
plastids
Definition
a group of plant organelles that are used for storage.
Term
mitochondria
Definition
are membrane-bound organelles in plant and animal that transfer energy for the cell.
Term
cytoskeleton
Definition
the support structure within the cytoplasm.
Term
microtubes
Definition
are thin, hollow cylinders made of protein.
Term
microfilaments
Definition
are small solid protein fibers.
Term
centrioles
Definition
are organelles found in the cells of animals and most protists.
Term
cilia
Definition
are short, numerous projections that look like hairs.
Term
flagella
Definition
are longer projections that move with a whiplike motion.
Term
peroxisome
Definition
contain enzymes to breakdown harmful chemicals.
Term
chlorophyll
Definition
traps light energy and gives leaves the stems their green color.
Term
isotonic solution
Definition
concentration of dissolved substances in a solution is the same as the dissolved substance in the cell.
Term
hypertonic solution
Definition
concentration of dissolved substances outside of the cell is higher than the concentration inside of the cell.
Term
hypotonic solution
Definition
the concentration of dissolved substances is lower in the solution outside of the cell than the solution inside of the cell.
Term
facilitated diffusion
Definition
passive-transport of materials across the membrane using transport proteins.
Term
active transport
Definition
movement of materials through a membrane against a concentration gradient.
Term
Endocytosis
Definition
process by which a cell surrounds and takes in material from its environment.
Term
Exocytosis
Definition
expulsion or secretion of materials from a cell.
Term
chromosomes
Definition
structures that contain DNA and become darkly colored when stained.
Term
cell cycle
Definition
the sequence of growth and division of a cell.
Term
interphase
Definition
the majority of a cell's life is spent in this growth period
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