Exploring the 3 Domains of Life

What are the main characteristics of bacteria?

• Main characteristics of bacteria include being unicellular, prokaryotic, having a cell wall, reproducing asexually, and exhibiting diverse metabolic capabilities.

• Multicellular and eukaryotic

• Reproduce sexually and have a nucleus

• Lack a cell wall and are autotrophic

How do bacteria reproduce?

• Bacteria reproduce asexually through binary fission.

• Bacteria reproduce sexually through conjugation.

• Bacteria reproduce through spore formation.

• Bacteria reproduce by budding off from a parent cell.

What is the difference between prokaryotic and eukaryotic cells?

• Prokaryotic cells do not have a nucleus; eukaryotic cells do.

• Eukaryotic cells are always smaller than prokaryotic cells.

• Prokaryotic cells have membrane-bound organelles; eukaryotic cells do not.

• Prokaryotic cells have multiple chromosomes; eukaryotic cells have one.

Name one unique feature of archaea compared to bacteria.

• Peptidoglycan cell wall in archaea.

• Unique membrane lipids (ether-linked) in archaea.

• Ribosomes are larger in archaea than in bacteria.

• Archaea reproduce by binary fission like bacteria.

What are the three domains of life?

• Bacteria, Archaea, Eukarya

• Fungi, Protista, Plantae

• Bacteria, Viruses, Eukarya

• Archaea, Fungi, Animalia

How do bacteria obtain energy?

• Bacteria do not require energy to survive.

• Bacteria obtain energy through cellular respiration, fermentation, or photosynthesis.

• Bacteria obtain energy solely from sunlight.

• Bacteria obtain energy exclusively from inorganic compounds.

What role do bacteria play in the ecosystem?

• Bacteria are primarily responsible for producing oxygen in the atmosphere.

• Bacteria are harmful and have no role in ecosystems.

• Bacteria are essential for nutrient cycling, decomposition, and symbiotic relationships in ecosystems.

• Bacteria only cause diseases in plants and animals.

In what ways do the domains differ in genetic material?

• Bacteria have circular DNA, Archaea have unique features, and Eukarya have linear DNA with introns.

• Eukarya have unique features in their DNA structure.

• Bacteria have linear DNA with introns.

• Archaea have circular DNA similar to bacteria.

What is a common method used to classify bacteria?

• Endospore staining

• Gram staining

• Acid-fast staining

• Negative staining

How do the cell walls of bacteria differ from those of archaea?

• Archaeal cell walls are thicker than bacterial cell walls and contain more lipids.

• Bacterial cell walls are made of cellulose, while archaeal cell walls contain peptidoglycan.

• Both bacterial and archaeal cell walls are composed of the same materials.

• Bacterial cell walls contain peptidoglycan, while archaeal cell walls do not and are made of different polymers.