Bacteria

Which of the following statements accurately describes bacteria?

• Bacteria are primarily found in the atmosphere.
• Bacteria are the most abundant organisms on Earth.
• Bacteria can only survive in warm environments.
• Bacteria are larger than most eukaryotic cells.

What unique environments have bacteria been discovered in?

• Only in soil and water.
• In extreme environments such as the ocean floor and volcanoes.
• Only in tropical regions.
• Exclusively in human bodies.

What role do bacteria play in the human body?

• They are all harmful and cause diseases.
• They help in digestion and nutrient absorption.
• They have no significant role.
• They only exist on the skin surface.

How many more bacterial cells are there in the human body compared to human cells?

• Twenty times more bacterial cells.
• Equal numbers of bacterial and human cells.
• Five times more bacterial cells.
• Ten times more bacterial cells.

Which of the following statements about bacteria is true?

• All bacteria are harmful to humans.
• Bacteria are only found in soil.
• Some bacteria are beneficial and useful.
• Bacteria cannot survive in extreme conditions.

What is a defining characteristic of bacteria?

• They are eukaryotic organisms.
• They are multicellular organisms.
• They are prokaryotic microorganisms without a nucleus.
• They have complex organ systems.

What component is found in the cell walls of bacteria?

• Cellulose
• Chitin
• Peptidoglycan
• Lignin

Which type of bacteria is known for its ability to perform photosynthesis?

• Lactobacillus
• Staphylococcus
• E. coli
• Cyanobacteria

What is the primary way most bacteria obtain energy?

• Through photosynthesis only.
• By consuming other organisms.
• From inorganic compounds exclusively.
• By absorbing sunlight directly.

What is the primary method of reproduction in bacteria?

• Fragmentation
• Budding
• Sexual reproduction
• Binary fission