1 / 20

NOTES : 7.1 - Introduction to the Cell

Delve into the world of cells with this informative guide covering cell theory, microscope types, cell classification, and the role of the nucleus in cellular function. Understand the differences between prokaryotic and eukaryotic cells and explore their characteristics. Learn about the fascinating structures and functions that make up all living organisms at the cellular level.

salvadorh
Download Presentation

NOTES : 7.1 - Introduction to the Cell

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NOTES: 7.1 - Introduction to the Cell

  2. Cell Theory • All living things are composed of 1 or more cells. • In organisms, cells are the basic unit of structure & function • Cells are produced only from existing cells.

  3. MICROSCOPES • Light Microscope • Electron Microscope (1940’s) • Scanning Electron Microscope • Transmission Electron Microscope

  4. Light Microscope • works by passing visible light through a thin section of specimen and then through glass lenses • magnification about 1000x - 1500x

  5. Electron Microscope (1940’s) • uses electron beams which have shorter wavelengths of light (so you can see smaller objects…more detail) • magnification up to 500,000x

  6. Electron Microscope • Scanning Electron Microscope • electron beam scans the surface of a specimen • useful for studying the surface of specimen in 3-D • Transmission Electron Microscope • electrons transmitted through specimen • used to study internal cell structure

  7. Disadvantages to EM… • can only view dead cells (preparation steps kill living cells) • very expensive zooxanthellae cells cultured from coral Aiptasia pulchella in a Scanning Electron Microscope

  8. Cell Types & Classification!

  9. ALL CELLS: • have a cell membrane • have cytoplasm • have ribosomes • can reproduce & contain genetic material

  10. CELLS CAN BE CLASSIFIED AS: 1. PROKARYOTES 2. EUKARYOTES See… no nucleus!!! See… a nucleus!!!

  11. PROKARYOTES EUKARYOTES • oldest cells (3.5 billion years) • “newer” cells (1.5 billion years)

  12. PROKARYOTES EUKARYOTES • oldest cells (3.5 billion years) • single celled • “newer” cells (1.5 billion years) • single or multicellular

  13. PROKARYOTES EUKARYOTES • oldest cells (3.5 billion years) • single celled • lack nucleus & membrane-bound organelles • “newer” cells (1.5 billion years) • single or multicellular • have a “true” nucleus & membrane-bound organelles

  14. PROKARYOTES EUKARYOTES • oldest cells (3.5 billion years) • single celled • lack nucleus & membrane-bound organelles • genetic material in a single, circular molecule • “newer” cells (1.5 billion years) • single or multicellular • have a “true” nucleus & membrane-bound organelles • genetic material organized and in nucleus

  15. PROKARYOTES EUKARYOTES • oldest cells (3.5 billion years) • single celled • lack nucleus & membrane-bound organelles • genetic material in a single, circular molecule • small (1-2 µm) • “newer” cells (1.5 billion years) • single or multicellular • have a “true” nucleus & membrane-bound organelles • genetic material organized and in nucleus • larger (2-1000 µm)

  16. PROKARYOTES EUKARYOTES • oldest cells (3.5 billion years) • single celled • lack nucleus & membrane-bound organelles • genetic material in a single, circular molecule • small (1-2 µm) • Kingdoms archaebacteria & eubacteria • “newer” cells (1.5 billion years) • single or multicellular • have a “true” nucleus & membrane-bound organelles • genetic material organized and in nucleus • larger (2-1000 µm) • Kingdoms Protista, Fungi, Plantae, Animalia

  17. NUCLEUS • membrane-bound organelle in eukaryotic cells; • contains the cell’s DNA • enclosed by a nuclear envelope • contains all of the information for cell to function

More Related