Microbiology Exam 1 Chapters 1-9

MICROBIOLOGY EXAM 1
CHAPTERS 1-9
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, Certainly! Here's a numbered list of all your questions along with their answers:



1. **What are Archaea? Bacteria? and Eukaryotes? How are they similar and different?**

- **Archaea:** Single-celled organisms with unique rRNA gene sequences, lacking
peptidoglycan in cell walls, having unique membrane lipids, often found in extreme
environments.

- **Bacteria:** Usually single-celled, with cell walls containing peptidoglycan, mostly lack
membrane-bound nuclei, ubiquitous, some in extreme environments, cyanobacteria
produce oxygen.

- **Eukaryotes:** Larger than bacteria and archaea, include protists, fungi, plants, animals;
have membrane-bound nuclei; some have cell walls (e.g., fungi, plants), others lack (e.g.,
animals).

- **Similarities:** All are cellular life forms (except viruses); all contain DNA.

- **Differences:** Cell structure, genetic material organization, cell wall composition.



2. **Domain Bacteria:**

- Usually single-celled.

- Majority have cell wall with peptidoglycan.

- Most lack a membrane-bound nucleus.

- Ubiquitous; some live in extreme environments.

- Cyanobacteria produce significant oxygen.



3. **Domain Archaea:**

- Distinguished by unique rRNA gene sequences.

- Lack peptidoglycan in cell walls.

- Have unique membrane lipids.

- Some have unusual metabolic characteristics.

- Many live in extreme environments.



4. **Domain Eukarya:**