Cells Basic Building Block of Life Cell Theory

Cells Basic Building Block of Life

Cell Theory 1) Cells are the basic units of structure & function in living organisms. 2) All living organisms are composed of 1 or more cells. a. Schleiden: all plants composed of cells b. Schwann: all animals composed of cells 3) All cells come from preexisting cells. a. Virchow contributed this.

Prokaryotes • First life form: Archaea & Bacteria • Note cell wall & cytoplasmic membrane • No membrane-bound organelles • DNA in nucleoid • Ribosomes present • Errors in figure • Flagellum, singular • Cytosol

Different Cell Types

Eukaryotes • Protists, Fungi, Plants, & Animals • Have membrane-bound organelles • • Nucleus with nucleolus Endoplasmic reticulum: rough & smooth Golgi apparatus Mitochondrion Chloroplasts, Chromoplasts, & other plastids Vacuoles: plants’ 1 central vacuole; animals- many Vesicles: lysosomes, peroxisomes, glyoxysomes

Characterized Animal Cell

Blood Cell Types & Their Development

Things to know for the Exam • • Cell types Structure-function relationship Form follows function. Size varies greatly. Organelles specific for animals vs. plants Function of all organelles. Plasma membrane structure & function.

Cell membrane: Fluid mosaic model