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31 Cards in this Set

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  • Back
the basic units of living organisms
Cell
has a series of lenses that magnify an object in steps.
compound light microscope
aims a beam of electrons through a magnetic field to focus them, then through or over the surface of a specimen in a vacuum, and finally onto a screen wear it shows a picture
electron microscope
an organism with a cell that lacks internal structers surrounded by membranes.
procaryote
an organism with a cell that lacks internal structers surrounded by membranes.
procaryote
an organism that has cells containing internal, membrane-bound structures
eukaryote
membrane-bound structure
organelles
contains the cells DNA
nucleus
serves as a boundary between the cell and its external enviroment
plasma membrane
a inflexible structure that surrounds the plasma membrane.
cell wall
when the cells are ready to reproduce
chromatin
a region that produces tiny cell particles that are involved in protein syntheisis
nucleolus
the sites where the cell assembles enzymes and other proteins according to the directions of the DNA
ribosomes
a clear fluid that is a bit thinner then toothpaste
cytoplasm
a folded membrane that forms a network of interconnected compartments inside the cell
endoplasmic reticulum
a series of closely stacked, flattened membrane sacs that recieve newly synthizied proteins.
golgi appartaus
a sac of fluid surrounded by a membrane
vacuole
organelles that contain digestive enzymes, or digest excess or worn out cell parts
lysosomes
organelles in which the food molecules are broken down to release energy
mitochondria
transforms light energy directly into usable chemical energy and store that energy in food molecules
choroplasts
a green pigment that traps eneregy from sunlight and traps it and gives the plants its color.
CHLOROPHYLL
a network of thin fibrous elements that act as a sort of scaffold to support for organelles
cytoskeleton
thin hollow cylinders made of protein
microtubules
thin soldif protein fibers
microfilaments
short hair off a plasma membrane
cilia
longer projections that move with a whiplike motion
flagella
one cell
unicellular
more then one cell
multicellular
group of cells that perform an activity
tissue
two or more tissues that function together
organ
a group of organs that work together to carry out major life functions
organ system