Cells Living Environment

Objectives…I can… Explain the contributions that led to the development of the cell theory. Describe the levels of organization within organisms. Describe the structure and function of cell organelles. Understand the distinguishing characteristics between animal and plant cells.

Two Types of Cells A. prokaryotic cells – very small, no nucleus, have few organelles Ex: bacteria

B. eukaryotic cells – have a nucleus and organelles that carry out specific functions in the cell Ex: plant, animal, fungi cells

CFU What are two differences between prokaryotic and eukaryotic cells? Give an example of each type of cell.

Cell History A. 1665 – Robert Hooke observes cork and uses the term “cell”

1674 – Anton van Leeuwenhoek – makes a single lens microscope

1838 – Matthias Schleiden – all plants are made of cells 1839 – Theodor Schwann – all living things are made of cells

Cell Theory A. Cells are the basic unit of life. B. All organisms are made of one or more cells. C. All cells come from existing cells.

Levels of Organization Multicellular Organisms Organism Organ System Organ Tissue Cell

Tissue-group of similar cells that perform a particular function. Organ-groups of tissues working together.

Plant Cells vs. Animal Cells Plant Cells Animal Cells

Animal and Plant Cells

CFU Place the following terms in order from simplest to most complex: organ, cell, organism, organ system, tissue