Domains of Life

Question 1

Criteria for development of three domains of life?

Answer 1

1. Sequence of nucleotides in r-RNA
2. Cell membrane lipid structure
3. Sensitivity to antibiotics
4. Complexity of cell structure

Question 2

Archaea :

Answer 2

• simplest, prokaryotic forms found in extreme environments
• no peptidoglycan
• ether linked phospholipid
• not sensitive to antibiotics

Question 3

Types of Archaea :

Answer 3

1. Methanogens ( Methane producing bacteria) :
2. Thermoacidophiles (Temperature loving bacteria)
3. Halophiles (Salt loving bacteria)

Question 4

Bacteria :

Answer 4

• Prokaryotic, unicellular
• ester linked phospholipid bilayer cell membrane
• Sensitive to antibiotics
• peptidoglycan present

Question 5

Eukarya :

Answer 5

• Eukaryotes
• not sensitive to antibiotics
• ester linked phospholipid bilayer