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Ch 4
Ch 4 DC Biology
20
Biology
10th Grade
11/08/2012

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Term
Cell Theory
Definition
The theory that all living organisms are composed of cells, which are the basic units of structure and function in living things which come from cells like themselves.
Term
Cell Membrane
Definition
A thin membrane surrounding a cell (plasma membrane).
Term
cell
Definition
The smallest unit of matter that can carry on all of the processes of life.
Term
actin
Definition
Protein threads that make up micro-filaments.
Term
Crista
Definition
The inner folds of the mitochondria that add surface area so that more chemical reactions can occur.
Term
chromatin
Definition
Long thin strands of DNA and protein.
Term
chromosomes
Definition
Densely packed Chromatin.
Term
cell wall
Definition
Tough, rigid covering of plant cell membranes.
Term
Fluid mosaic model
Definition
Shows the cell membrane to behave like a liquid with proteins moving within the lipid bilayer.
Term
eukaryotes
Definition
A cell that has a nucleus and membrane-bound organelles.
Term
cytosol
Definition
Cell fluid.
Term
cytoplasm
Definition
The area between the nucleus and cell membrane.
Term
integral protein
Definition
Proteins embedded in the cell phospholipid bilayer and extending through it.
Term
nucleus
Definition
The area of a cell that contains a cell’s genetic code (DNA).
Term
organ system
Definition
A group of organs that perform a set of related tasks.
Term
organelles
Definition
Internal structure of a cell.
Term
peripheral protein
Definition
Proteins attached to the cell membrane on the interior or exterior surface.
Term
prokaryotes
Definition
Unicellular organisms without a membrane-bound nucleus and organelles.
Term
Selectively permeable membrane
Definition
Has the ability to control what enters and exits the cell.
Term
spindle fiber
Definition
Bundles of microtubules that assist in movement of chromosomes during cell division.
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