Download Prelecture Worksheet Chapter 27

Prelecture Worksheet Chapter 27
Name: ____KEY______________________
1. List the two Domains that encompass the prokaryotes:
Archaea and Bacteria
2. List the differences between gram positive and gram negative bacteria
gram positive bacteria can hold the gram stain due to the simplicity of their cell wall.
3. List three ways that bacteria use to stick to substrates and each other.
Fimbriae, pili and the capsule
4. What are the four modes of nutrition found in prokaryotes
photoautotropic, chemoautotrophic, photoheterotrophic and chemoheterotrophic
5. Plasmids _____.
a. replicate independently of the main chromosome
b. often contain antibiotic resistance genes
c. are transferred from one bacterium to another by conjugation
d. allow bacteria to survive adverse conditions
e. all of the above
6. In an experiment, a microbiologist put equal numbers of each of the following organisms into a flask
of sterile broth, consisting mostly of sugar and a few amino acids. She then placed the flask in the dark.
Which of the organisms would be most likely to survive?
a. chemoheterotrophic bacteria
b. cyanobacteria
c. photoheterotrophs
d. thermoacidophilic bacteria
e. photoautotrophs
7. The Desulfovibrio bacterium breaks down organic matter (which it must have) and uses sulfate (not
oxygen) as an electron acceptor. As a result, it produces hydrogen sulfide (H2S), accounting for the
"rotten egg" smell of swamp muck. Oxygen is a deadly poison to Desulfovibrio. We would call
Desulfovibrio a(n) _____.
a. facultatively aerobic chemoheterotroph
b. obligately anaerobic chemoheterotroph
c. facultatively anaerobic chemoautotroph
d. obligately anaerobic chemoautotroph
8. Define symbiosis
a relationship between two organisms that can be positive, negative or neutral for one or both
players
9. What are some functions (positive and negative) of prokaryotes in the world?
Illness, cheese, etc…
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