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Microorganisms Lecture Week 4

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Questions and Answers

What is a key characteristic of Archaea that distinguishes them from bacteria?

Stereochemically opposite lipids with ether linkages (correct)

Use of N-formylmethionine as the initiator amino acid

Presence of true peptidoglycan in the cell envelope

Lack of operons in their circular chromosomes

Which archaeal group is known for its ability to grow at extremely high temperatures?

Methanogens

Haloarchaea

Euryarchaeota

Crenarchaeota (correct)

What type of energy metabolism pathway do most Euryarchaeota follow?

Fermentation

Methanogenesis (correct)

Aerobic respiration

Photosynthesis

What is a common habitat for Haloarchaea?

Marine sediments Signup and view all the answers

How do Archaeal membranes differ from bacterial membranes?

Isoprenoid lipids with ether linkages Signup and view all the answers

What distinguishes the transcription machinery of Archaea from Bacteria?

Recognition of eukaryotic-like promoters Signup and view all the answers

What characteristic makes Haloarchaea able to thrive in saturated salt brine?

'S-layers' in their cell walls Signup and view all the answers

What powers Eukaryotic Flagella and Cilia?

Dyneins Signup and view all the answers

What is the primary function of Phagocytosis in 'protozoa'?

Endocytosis of particles Signup and view all the answers

Which organelle is responsible for photosynthesis in many Algae?

Chloroplast Signup and view all the answers

What is a key feature of the nucleus in eukaryotic organisms?

Contains DNA packaged around histone proteins Signup and view all the answers

Which organelles have their own genome and bacterial-like ribosomes?

Mitochondria and plastids Signup and view all the answers

What is a characteristic feature of plastids in eukaryotes?

Can be cyanobacterial-like Signup and view all the answers

How are secondary plastids formed in eukaryotes?

From the engulfment of a primary alga by another eukaryote Signup and view all the answers

What distinguishes Archaeplastida as a clade?

Plastids of primary endosymbiotic origin Signup and view all the answers