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Cells

Cells. Or how humans are similar to amoebas. Organisms are Diverse yet Share similar Characteristics. All organisms are made up of cells. Organisms have similar chemical compositions. All living things require energy. Organisms can grow and develop. All living things reproduce. .

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Cells

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  1. Cells Or how humans are similar to amoebas

  2. Organisms are Diverse yet Share similar Characteristics • All organisms are made up of cells. • Organisms have similar chemical compositions. • All living things require energy. • Organisms can grow and develop. • All living things reproduce.

  3. Unicellular Organisms Clockwise from upper left: diatoms, salmonella bacteria, cholera bacteria, protist

  4. Multicellular Organisms In multicellular organisms, cells are often organized into tissues, organs and organ systems

  5. Cell Structure • Cell wall (plants only): protects & supports the cell. • Cell membrane: controls what enters & leaves the cell. • Nucleus: directs all the cell’s activities. • Nuclear envelope: protects the nucleus. • Chromatin: contains the genetic material. • Nucleolus: where ribosomes are made. • Cytoplasm: thick, gel-like fluid containing the organelles.

  6. Cells & Organelles • Mitochondria • Endoplasmic reticulum • Ribosomes • Golgi bodies • Chloroplasts • Vacuoles • Lysosomes • Chloroplasts (plants only)

  7. Cell Diversity The variety of structures in cells reflects differences in cell function

  8. Describe how humans are similar to amoebas.

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