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Science 7
Ch. 2 voc. #1
Term | Definition |
---|---|
cell theory | states that all living things are made of one or more cells that cell is the smallest unit of life and all new come from preexisiting |
macromolecules | form by joining many small molecules together |
proteins | are long chains of amino acids |
lipids | is a large macromolecule that does not dissolve in water |
carbohydrates | one sugar molecule, two sugar molecules, or a long chain of sugar molecules make up |
cellulose | is a carbohydrate in cell walls in plants that provides structural support |
cell membrane | is flexible covering that protects the inside of a cell from the environment outside a cell |
cell wall | is a stiff structure outside the cell membrane |
cilia | are short hairlike structures |
cytoplasm | a fluid inside a cell that contains salts and other molecules |
cytoskeleton | is a network of threadlike proteins that are joined together |
prokaryotic cell | is not surrounded in membrane |
eukaryotic cell | contains one nucleus and is surrounded by membrane |
organelles | have specialized functions |
nucleus | a part of a eukaryotic cell that directs cell activities and contains genetic information stored in DNA |
Nucleolous | is often seen as a larger black spot in the nucleus of a cell |
nuclear envelope | surrounding the nucleaus are two membranes that form a structure call this |
ribosomes | small structures that make proteins |
endoplasmic reticulum (ER) | sprouts from the nucleus throughout most of the cytoplasm |
mitochondria | organelle responsible for production of energy |
ATP | is the fuel for cellular process such as growth cell division and material transport |