Exploring Bacterial Evolution and Classification

How are bacteria primarily classified based on their cell wall composition?

• By their ability to photosynthesize

• By their shape

• By their Gram stain reaction

• By their habitat

Which of the following is a characteristic of gram-positive bacteria?

• They have a thin peptidoglycan layer.

• They have a thick peptidoglycan layer.

• They lack a cell wall.

• They are resistant to antibiotics.

What pigment do cyanobacteria use for photosynthesis?

• Carotenoids

• Phycobilins

• Chlorophyll

• Anthocyanins

Which type of extremophile thrives in highly saline environments?

• Acidophile

• Halophile

• Hyperthermophile

• Psychrophile

What is a key difference between Archaea and Bacteria?

• Archaea have a nucleus, while Bacteria do not.

• Archaea have different membrane lipids compared to Bacteria.

• Archaea are all photosynthetic, while Bacteria are not.

• Archaea are multicellular, while Bacteria are unicellular.

Which of the following is NOT a force that caused prokaryotic evolution?

• Natural selection

• Genetic drift

• Horizontal gene transfer

• Photosynthesis

What type of extremophile would you expect to find in a hot spring?

• Halophile

• Acidophile

• Hyperthermophile

• Psychrophile

Which of the following best describes an acidophile?

• An organism that thrives in high salt concentrations

• An organism that thrives in high temperatures

• An organism that thrives in acidic environments

• An organism that thrives in cold environments

What is the primary role of cyanobacteria in the environment?

• Decomposing organic matter

• Fixing nitrogen in the soil

• Producing oxygen through photosynthesis

• Causing diseases in plants

Which of the following statements is true about gram-negative bacteria?

• They have a thick peptidoglycan layer.

• They have an outer membrane containing lipopolysaccharides.

• They are more susceptible to antibiotics than gram-positive bacteria.

• They lack a cell wall.