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Chapter 7
Cell Structure and Function
41
Biology
10th Grade
02/22/2007

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Term
Cells
Definition
The basic unit of life
Term
Cell Theory
Definition
- All living things are composed of cells
- Cells are the basic unit of structure and function in living things
- New cells are produced from existing cells
Term
Nucleus
Definition
Large membraner-enclosed structure that contains the cells genetic materuak in the form of DNA
Term
Eukaryotes
Definition
Cells that contain nuclei
Term
Prokaryotes
Definition
Cells that do not contain nuclei
Term
Organelles
Definition
"Little Organs", structures that act as if they are specialized organs in cells
Term
Cytoplasm
Definition
Portion of the cell outside the nucleus
Term
Nuclear Envelope
Definition
Surrounds the nucleus, allows material to move in and out of the nucleus
Term
Chromatin
Definition
granulated material you can see in the nucleus, consists of DNA bound to protein
Term
Chromosomes
Definition
Condensed chromatin, threadlike structures containing genetic information
Term
Nucleulus
Definition
Small, dense region of the nucleus were the assembly of ribosomes begins
Term
Ribosmes
Definition
Small particles of RNA and protein found throughout the cytoplasm
Term
Endoplasmic Reticulum
Definition
Internal membrane system, the site were lipid components of the cell membrane are assembled
Term
Golgi Apparatus
Definition
Used to modify, sort, and package proteins and other material from the endoplasmic reticulum for storage in the cell or secretion outside the cell
Term
Lysosomes
Definition
Small organelles filled with enzymes, used to digest lipids, carbohydrates, and proteins
Term
Vacuoles
Definition
In plant cell, used for storage
Term
Mitochondria
Definition
Convert the chemical energy stored in food into compounds that are more convenient for the cell to use
Term
Chloroplasts
Definition
Capture energy from the sunlight and convert it into chemical enerdy in photosynthesis
Term
Cytoskeleton
Definition
Network of protein filaments that helps the cell to maintain its shape
Term
Centrioles
Definition
located near nucleus, used to help organize cell division
Term
Cell Membrane
Definition
Thin, flexible barrier surrouning the cell
Term
Cell Wall
Definition
strong supporting layer around cell membrane
Term
Lipid Bilayer
Definition
Composition of nearly all cell membranes, double layered
Term
Concentration
Definition
mass of solute in a given volume of solution, or mass/volume
Term
Diffusion
Definition
When particles move from one area where they are more concentrated to an area where they are less concentrated
Term
Equilibrium
Definition
When the concentration of the solute is the saam throughout a system
Term
Omosis
Definition
Diffusion of water through a selectively permeable membrane
Term
Isotonic
Definition
When the concentration of water and sugar are the ame on both ides of the membrane, "Samer strength"
Term
Hypertonic
Definition
The more concentrated sugar solution, "above strength"
Term
Hypotonic
Definition
Dilute sugar solution, "below strength"
Term
Facilitated
Definition
Movement of specific molecules across the cell membranes through protein channels
Term
Active Transport
Definition
Energy requiring process that moves material across a cell membrane againt a concentration difference
Term
Endocytosis
Definition
Taking material into the cell by means of infolding of the cell membrane
Term
Phagocytosis
Definition
"cell eating", extensions of cytoplasm surrounding a particle and package it within a food olcuole
Term
Pinocytosis
Definition
Tiny pockets form along the cell membrane, fill with liquid, and pinch off to form vacuoles within the cell
Term
Exocytosis
Definition
Membreane of the vacuole surrounding the material fuses with the cell membrane, forcing the contents out of the cell
Term
Cell Specialization
Definition
Cells throughout an organism can develop in different ways to perform different tasks
Term
Tissue
Definition
Group of similar cells that perform a particular function
Term
Organ
Definition
Many tissues working together
Term
Organ System
Definition
A group of organs that work together to perform a spesific function
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