DOL – Archaea, Bacteria, and Ecosystems

Which of the following BEST explains one difference between archaebacteria and eubacteria?

• A. Archaebacteria are multicellular, while eubacteria are unicellular.

• B. Archaebacteria live in extreme environments, while eubacteria live in common environments.

• C. Archaebacteria can only make their own food, while eubacteria cannot.

• D. Archaebacteria are plants, while eubacteria are animals.

Which statement describes a similarity between archaebacteria and eubacteria?

• Both have a nucleus to control cell functions.

• Both are made of more than one cell.

• Both are prokaryotes without a nucleus.

• Both survive only in extreme environments.

Why are archaebacteria and eubacteria important in ecosystems?

• They produce oxygen and help recycle nutrients.

• They are always harmful to other organisms.

• They can only live inside animal hosts.

• They do not interact with other organisms.

Which of the following is a characteristic unique to archaebacteria?

• They perform photosynthesis like plants.

• They are always multicellular.

• They have cell walls without peptidoglycan.

• They contain a true nucleus.

What role do eubacteria commonly play in the human digestive system?

• They help break down food and produce vitamins.

• They cause all digestive diseases.

• They only live in the bloodstream.

• They prevent all nutrient absorption.

Which environment would most likely support the growth of archaebacteria?

• A temperate forest floor.

• A hot spring with high acidity.

• A freshwater pond with mild temperatures.

• A sandy beach with moderate climate.

Which process is commonly carried out by eubacteria in soil ecosystems?

• Regulation of animal body temperature.

• Production of oxygen through photosynthesis.

• Decomposition of organic matter.

• Formation of volcanic rocks.

What is a key difference between the cell walls of archaebacteria and eubacteria?

• Archaebacteria lack peptidoglycan in their cell walls, while eubacteria have it.

• Neither group has a cell wall.

• Both have identical cell wall structures.

• Archaebacteria have cell walls with peptidoglycan, eubacteria do not.

Which of the following environments is least likely to contain eubacteria?

• A freshwater lake.

• A garden soil.

• A human mouth.

• A boiling acidic hot spring.

Which of the following is NOT a typical habitat for archaebacteria?

• Temperate grasslands.

• Boiling acidic springs.

• Highly saline lakes.

• Deep-sea hydrothermal vents.