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Chapter 7 {Cells}

TermDefinition
Cell Basic units of life
Cell Theory A fundamental concept of biology.
Cell Membrane A thin flexible barrier surrounding a cell
Nucleus A large membrane enclosed structure that contains genetic material in the form of DNA and control's many of the cell's activities
Eukaryote Cells that enclose their DNA in nuclei.
Prokaryote Cells that do not enclose DNA in nuclei.
Cytoplasm the portion of the cell outside the nucleus
Organelle literally "little organs"
Vacuole Large, saclike, membrane-enclosed structures in cells
Lysosome
Cytoskeleton Eukaryotic cells are given their shape and internal organization by this network of protein filaments
Centriole Located in the nucleus and help organize cell division.
Ribosome are small particles of RNA and protein found throughout the cytoplasm in all cells
Endoplasmic Reticulum or ER, they are found in Eukaryotic cells and are internal membrane system.
Golgi Apparatus A stack of flattened membranes.
Chloroplast Capture the energy from sunlight and convert it into food that contains chemical energy in a process called photosynthesis
Mitochondrion Convert the chemical energy stored in food into compounds that are more convenient for the cell to use.
Cell Wall A strong supporting layer around the membrane
Lipid Bilayer gives cell membranes a flexible structure that forms a strong barrier between the cell and its surroundings.
Selectively Permeable Biological membranes can have some substances can pass across them and others cannot.
diffusion the driving force behind the movement of may substances across the cell membrane.
facilitated diffusion process in which molecules cannot directly diffuse across the membrane and pass through a special protein channels.
aquaporin Water channel proteins
osmosis the diffusion of water through selectively permeable membranes.
isotonic
hypertonic
hypotonic
osmotic pressure The movement of water out of or into a cell produces this force.
homeostasis Relatively constant internal physical and chemical conditions
tissue a group of similar cells that preform a particular function.
Organ When many groups of tissues work together
Organ System A group of organs that work together to specialize tasks.
Receptor To respond to a chemical signal, a cell must have this to which the signaling molecule can bind.
Created by: schwartzs17