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Cell Structure
Vocab
26
Biology
9th Grade
12/16/2013

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Term
Cell Membrane
Definition
Thin, Flexible barrier that surrounds all cells; regulates what enters and leaves
Term
Nucleus
Definition
Contains the cell's genetic material in the form of DNA
Term
Eukaryote
Definition
Organism whose cells contain a nucleus
Term
Prokaryote
Definition
Unicellular organism that lacks a nucleus
Term
Cytoplasm
Definition
Eukaryotic cells: All cellular contents outside the nucleus
Prokaryotic cells: All of the cells' contents
Term
Organelle
Definition
Specialized structure that performs important cellular functions within a cell
Term
Vacuole
Definition
Cell organelle that stores materials such as water, salts, proteins, and carbohydrates
Term
Lysosome
Definition
Cell organelle that breaks down lipids, carbohydrates, and proteins into small molecules that can be used by the rest of the cell.
Term
Cytoskeleton
Definition
Network of protein filaments in a eukaryotic cell that gives the cell its shape and internal organization.
Term
Centriole
Definition
Structure in an animal cell that helps to organize cell division
Term
Ribosome
Definition
Cell organelle made of RNA and protein, found throughout cytoplasm, site of protein synthesis
Term
Endoplasmic Reticulum
Definition
Internal membrane system found in eukaryotic cells; place where lipid components of the cell membrane are assembled
Term
Golgi Apparatus
Definition
organelle that modifies, sorts, and packages proteins and other materials from the endoplasmic reticulum for storage in the cell or release outside the cell.
Term
Chloroplast
Definition
Plant organelle that captures the energy from sunlight and converts it into chemical energy
Term
Mitochondrion
Definition
Organelle that converts the chemical energy stored in food into compounds that are more convenient for the cell to use
Term
Cell Wall
Definition
Strong, supporting layer around the cell membrane in some cells
Term
Lipid Bilayer
Definition
Flexible double-layered sheet that makes up the cell membrane and forms a barrier between the cell and its surroundings
Term
Selectively Permeable
Definition
Property of membranes that allows some substances to cross cell membrane
Term
plasmodesmata
Definition
Cytoplasm that passes through the cell walls of adjacent plant cells and allows communication between them.
Term
Osmosis
Definition
Diffusion of water through a selectively permeable membrane
Term
Diffusion
Definition
Particles move from where they are more concentrated to where they are less concentrated
Term
Peroxisome
Definition
Organelle in the cytoplasm that contains the reducing enzyme catalase and usually some oxidases.
Term
Chromatin
Definition
one of the two identical "sister" parts of a duplicated chromosome
Term
Microtubule
Definition
Tubular structure present in the cytoplasm, sometimes aggregating to form more complex structures.
Term
Hypertonic
Definition
A higher concentration of something in a solute than the solvent
Term
Hypotonic
Definition
A lesser concentration of something in a solute than the solvent
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