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Chapter 7. Cells. skin cells (flat shape). red blood cells (disk). Cell Intro. Cell-smallest unit that can carry on all the processes of life All living things have cells Organelle-cell structures that performs specific functions for the cell “little organs”

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skin cells flat shape

skin cells (flat shape)

red blood cells (disk)

cell intro
Cell Intro
  • Cell-smallest unit that can carry on all the processes of life
    • All living things have cells
  • Organelle-cell structures that performs specific functions for the cell
    • “little organs”

*celltissueorgansystem

slide4
CELL SCIENTISTS

1. Robert Hooke

  • British, mid-1600’s
  • Compound light microscope
  • Saw cells in cork & called them “cells”
slide5
2. Anton van Leeuwenhoek
  • Dutch, mid-1600’s,
  • simple light microscope,
  • saw life in pond water
slide6
3. The Cell Theory

a. All organisms are composed of one or more cells.

b. Cell is the basic unit of organization of organisms.

c. All cells come from pre-existing cells.

slide7

All cells have 2 things

Cell Membrane

DNA

slide8
4. Two basic cell types (figure 7.4)

a. Prokaryotes

1. organelles float around cell; unorganized

* No nucleus

2. ex. bacteria

prokaryotic cells
Prokaryotic Cells

Anthrax

Types of Shapes

slide10

b. Eukaryotes

1. have membranes around organelles; organized

* Have a nucleus and genetic material is separate from rest of cell

2. ex. plants, animals, fungi

3. Usually larger than prok.

eukaryotic cells
Eukaryotic Cells

Muscle Cells Nucleus Kidney Cell

viruses
Viruses
  • Reproduce in other living things
  • DNA or RNA surrounded by protein coat

Foot & Mouth Disease Virus

comparison chart
Comparison Chart -

Assignment: Page 173# 1,2,4,5