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Science Vocabulary

Science Vocabulary-Lessons 1-4- Chapter 1

Cells forms the parts of an organism and carries out all of its functions
Microscope is an instrument that makes small objects look larger
Cell Theory is a widely accepted explanation of the relationship of cells and living things
Cell Wall is a rigid layer that surrounds the cells of plants and some other organisms
Cell Membrane controls which substances pass into and out of a cell
Nucleus acts as a cell's control center, directing all of the cells activities
Organelles carries out specific functions within a cell
Ribosomes are small grain-shaped organelles that produce proteins
Mitochondria converts energy stored in food to energy the cell can use to live and function
Endoplasmic Reticulum often called the ER, is and organelle with a network of membranes that produces many substances
Golgi Apparatus receives proteins and other newly formed materials from the ER, packages them, and distributes them to form other parts of the cell or to the outside of the cell
Vacuole stores water, food, or other materials needed by the cell
Chloroplast captures energy from sunlight and changes it to a form of energy cells can use in making food
Lysosomes contains substances that break down large food particles into smaller ones
Multicellular made of many cells
Unicellular single-celled organisms
Tissue is a group of similar cells that work together to perform a specific function
Organ is made of different kinds of tissues that function together
Organ System is a group of organs that work together to perform a major function
Elements any substance that cannot be broken down into smaller substances
Compounds form when two or more elements combine chemically
Carbohydrates energy- rich organic compounds made of the elements carbon, hydrogen, and oxygen
Lipids are compounds that are mostly made of carbon and hydrogen and some oxygen
Proteins are large organic molecules made of carbon, hydrogen, oxygen, and, in some cases, sulfur
Enzymes speed up chemical reactions in living things
Nucleic Acids are very long organic molecules
DNA is the genetic material that carries information about an organism and is passed from parent to offspring
Double Helix the shape of a DNA molecule
Selectively Permeable that some substances can cross the membrane while others cannot
Passive Transport the movement of dissolved materials across a cell membrane without using the cell's energy
Osmosis is the diffusion of water molecules across a selectively permeable membrane
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration
Active Transport is the movement of materials across a cell membrane using cellular energy
Endocytosis the cell membrane changes shape and engulfs the particle
Exocytosis allows large particles to leave a cell
Created by: grace12345