1. CELLS
LESSON 7 NOTES

2. A. Basic Cell Info Basic unit of life
Organelle: well-defined structure found in a cell
All cells have:
Cell membrane:
Cytoplasm:
Nucleus: “command central”

3. A. Basic Cell Info continued
4. Animal Cell specific organelle:
Lysosome
Digestive enzymes
5. Plant Cell specific organelles:
Chloroplasts:
Green, disc-shaped structures circulating along perimeter of cell
contain chlorophyll
Photosynthesis can occur
Cell wall
Nonliving part of cell

4. B. Spirogyra Freshwater algae Cells arranged in long filaments
chloroplasts & chlorophyll
Photosynthesis can occur
Cellulose in their cell wall
Pyrenoids:
dark protein structure within chloroplast that store starch
Reproduction:
Asexually  separate into fragments
Sexually  conjugation (figure 7.4)

9. C. Elodea Leaves Refer to figure 7.3 Freshwater: Saltwater:
Concentration water higher outside cell
Water moves into cell  cell swells
Turgor Pressure: keeps cell from busting
Saltwater:
Concentration water higher inside cell
Water moves out cell  cell shrinks (PLASMOLYSIS)

12. D. Nerve Cell (Neurons) Dendrites: receive electrical nerve impulses
Axon: transfer impulse to another neuron, muscle, or gland cell
Cell Body: neuron’s nucleus