The Cell Theory • The cell is the basic unit ofstructure of all living things. • All living things are made up of cells. • The cell is the basic unit offunction of all living things. • Cells come from pre-existing cells.
Do Now! • Answer questions 1 + 2 on page 49 in UPCO text.
Exceptions to the Cell Theory • These are facts that can not be explained by the Cell Theory. • Viruses are not made up of cells, but they do contain genetic material. • The first cell could not have arisen from a previously existing cell, Scientists don’t know the origin of the first cell.
Do Now! • Answer question #1 on page 50 in UPCO.
History of Cell Study • Scientists did not know much about cells until the discovery of the microscope. • Cells are so small they can not be seen w/o a microscope. • Anton van Leeuwenhoek- Dutch naturalist (1600’s). Developed the first microscope. • Robert Hooke- English (1665) was the first to develop a compound microscope. He came up with the term cell.
History cont….. • Robert Brown- (1831) discovered the nucleus of the cell. • Matthias Schleiden- (German, around 1830’s) a Botanist, concluded that all plants were made up of cells. • Theodor Schwann- (German, worked during the same time as Schleiden), studied animal cells. Concluded that animals were made up of cells. • Rudolf Virchow- (1858) concluded that all new cells must come from previously existing cells.
Do Now! • Answer questions 1-9, page 51 in UPCO.
The Compound Microscope • Microscopes are used to study materials that can’t be seen with the naked eye. • Microscopes use two lenses (compound microscope) to increase the size of a specimen. • A specimen must be thin enough for light to pass through it. • The total magnification of an object is found by multiplying the magnification of the objective x the magnification of the eyepiece.
Parts of the Microscope • Look on page 52 in UPCO. Make sure that you know the parts of the Microscope, and the function of each part!
Do Now! • Label each part of the Microscope on the ditto. • Do questions 1-6 on pages 52-53 in UPCO.
Homework • Read and answer all questions in UPCO, pages 61-62.