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science seif

TermDefinition
cells basic units of structure and function in living things.
microscope instrument that make small objects look larger.
cell theory explanation of the relationship between cells and living things.
cell wall is a rigid layer that surrounds the cells of plants and some other organsims
cell membrane controls which substances pass into and and out of the cell
nucleus a large oval structure acts as the cell's control center
ribosomes small grain-shaped organelles that produce protein
cyytoplasm fluid fills the area between the cell membrane and the nucleus
mitochondria organelle converts energy stored in food to energy a cell can use to live and function
endoplasmic reticulum organelle which has a network of membranes that produce many substances
Golgi apparatus organelle that receive protein and other materials from the ER and package them, and distributes them to other parts of the cell or outside of the cell.
vacuoles a type of sac which stores water, food pr other materials needed by the cell
lysosomes organelle that break down large food particles into smaller ones
chloroplast green structures that capture energy from sunlight and changes it to form of energy the cell can use.
multicellular have many cells
unicellular have one cell
tissue a group of similar cells that work together to perform a specific function
organ a group of different kinds of tissues that function together
organ system a group of organs that work together to perform major function
element any substance that cannot be broken down into simpler substance
compound form when two or more elements combine chemically
carbohydrates energy rich organic compounds made of the elements carbon, hydrogen, and oxygen
lipids compounds that are made mostly of carbon, hydrogen and oxygen
proteins large organic molecules made of carbon, hydrogen, oxygen, nitrogen, and in some cases sulfur
nucleic acid very long organic molecules consists of carbon, hydrogen, oxygen, nitrogen and phosphorus
DNA genetic material that carries information about an organism and is passed from parents to offspring
double helix the shape of the DNA molecule
selectively permeable some substances can pass across the cell membrane while others cannot.
passive transport movement of dissolved materials across a cell membrane without using the cell energy
active transport movement of materials across a cell membrane using the cell energy
diffusion process by which molecules move from area of higher concentration to an area of lower concentration
osmosis diffusion of water molecules across a selectively permeable membrane
endocytosis the cell membrane changes shape and engulfs particles
exocytosis the cell membrane allows large particles to leave a cell
photosynthesis process by which a cell capture energy in the sunlight and uses it to make food
autotroph organism the can make its own food
heterotroph organism that cannot make its own food
chlorophyll green pigment inside the chloroplast that absorbs light
cellular respiration process by which cells obtain energy from glucose
Created by: mohamedelhussien