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Chapter 7.  English scientist who used an early light microscope to study nature.  Looked at cork (dead plant cells) under a microscope.  He observed.

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Presentation on theme: "Chapter 7.  English scientist who used an early light microscope to study nature.  Looked at cork (dead plant cells) under a microscope.  He observed."— Presentation transcript:

1 Chapter 7

2  English scientist who used an early light microscope to study nature.  Looked at cork (dead plant cells) under a microscope.  He observed small geometric shapes, and named them cells.

3  Dutch trader that made simple light microscopes.  His lenses were 10x more powerful than those that Hooke used.  First person to observe living cells

4  Matthias Schleiden (1838) – all plants are composed of cells.  Theodor Schwann (1839) – all animals are composed of cells.  Rudolf Virchow – all cells come from other cells.  These three observations helped form the cell theory

5 1. All organisms are composed of one or more cells 2. The cell is the basic unit of organization 3. All cells come from preexisting cells

6 Compound Light Microscope Electron Microscope  Use a series of lenses to magnify objects.  Magnify up to 1500x  Uses a beam of electrons to magnify objects  Magnify up to 500,000x their actual size  Scanning electron (SEM)  Transmission electron (TEM)

7  Prokaryotes – cells that do not have internal membrane-bound structures or a nucleus ex. Bacteria  Eukaryotes – cells that have a nucleus and membrane-bound structures. ex. Animal cells and plant cells - the membrane-bound structures are called organelles

8 Prokaryotic CellEukaryotic Cell

9  The boundary between the cell and its environment.  Controls what enters and exits the cell (selective permeability) - nutrients, wastes  Cells, like our bodies, like constant environment. The process of maintaining this environment is called homeostasis.

10

11  Has two layers of phospholipids back-to-back (phospholipid bilayer) - polar heads face out (like water) - nonpolar tails face in (hate water)  Cholesterol – helps stabilize the phospholipids (stops it from sticking together)  Transport proteins – regulate which molecules enter and leave the cell.  Carbohydrate chains – stick out from cell surface and helps cells identify each other.

12  Control center of the cell (contains directions to make proteins)  Master set of directions for making proteins is contained in chromatin (strands of DNA)  Inside the nucleus is another organelle called the nucleolus (makes ribosomes)  Ribosomes exit through nuclear pores

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14 Cytoplasm – clear fluid inside the cell Endoplasmic Reticulum (ER) – site of cellular chemical reactions - Rough ER (has ribosomes attached) - Smooth ER (no ribosomes) Golgi apparatus – modifies and packages proteins

15 Vacuoles – temporary storage of materials (food, enzymes, waste) Lysosomes – digest excess or worn out organelles, food particles, and engulfed viruses and bacteria Mitochondria – produce energy for the cell

16 Cytoskeleton – cells support structure made of microtubulues and micro- filaments. Cilia – short, hair-like projections that aid in movement and feeding Flagella – longer projections that move with a whip-like motion (movement)

17 Animal CellPlant Cell  Centriole (only animal cells)  Cell Wall  Chloroplasts  Large Vacuole


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