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Science cell
structure + function of a cell
Term | Definition |
---|---|
Cell | Basic unit of structure and function in living things |
Microscope | Instrument that magnifies objects to make small things look larger |
Simple microscope | Only has one lens |
Compound microscope | Has more than one lens |
Robert Hooke | English Scientist Looked at cork- called them "cells" |
Anton van Leeuwenhoek | Dutch business man Made his own lenses Looked at pond water- saw "animalcules" |
Cell theory | All living things are composed of cells Cells are the basic unit of structure and function in living things All cells are produced from other cells |
Resolution | Ability to clearly distinguish individual parts of an object |
Element | Any substance that cannot be broken down into simpler substances |
Atom | Smallest unit of an element |
Compound | Two or more elements combined chemically |
Molecule | Smallest unit of most compounds |
Organic compounds contain ________ | Carbon |
Define and give examples of a carbohydrate | Energy rich organic compound Sugar and starches ex: potatoes, noodles, rice, bread=starch |
Protein | Made up of amino acids ex: meat, eggs, fish, nuts, and beans |
Enzyme | Type of protein that speeds up chemical reaction |
Lipid | Fats, oils, waxes Cholesterol is a lipid Gives more energy Body stores lipids for later use |
What do nucleic acids do? (DNA & RNA) | DNA- Genetic material passed of from parent to offspring -Directs function of cell RNA- Production of proteins |
Selectively permeable | Some substances can pass through while others cannot |
Diffusion | Movement of molecules from an area of high concentration to an area of low concentration |
Osmosis | The diffusion of water molecules through a selectively permeable membrance |
Passive transport | Movement of materials through a cell membrane without using energy |
Active transport | Movement of materials through a cell membrane using energy |