Chapter 19 - Biology Honors Prentice Hall Textbook by...

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Biology Honors Prentice Hall Textbook by Miller/Levine Chapter 19 pg. 493 #1-35 12/11/09 pg.495 #1-11 Period 2 1. A 2. A 3. B 4. B 5. A 6. D 7. D 8. C 9. B 10. C 11. Prokaryotes are unicellular and they lack nuclei. 12. Prokaryote cells can be rod-shaped, spherical, spiral, or cork-screwed. 13. Scientists use a method called Gram staining to determine whether the bacteria have thin or  thick cell walls. Scientists apply a violet stain, which stains peptidoglycan cell walls, then they  wash out the stain with an alcohol treatment, and cells with thick walls still retain the violent  stain after the wash. Cells with thick walls are called Gram-positive bacteria, and scientists can  distinguish between these bacteria and Gram-negative bacteria. 14. Prokaryotes are either propelled flagella, whip-like structures or they lash, snake, or spiral  forward. Some prokaryotes do not move at all.  15. Photoautotrophs and chemoautotrophs both make organic carbon molecules from carbon  dioxide. However, photoautotrophs use light energy to photosynthesize, and chemoautotrophs  do not require light energy.  
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Chapter 19 - Biology Honors Prentice Hall Textbook by...

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