Which of the following is not one of the most common prokaryotic cell shapes?

Which structure is found only in prokaryotic cells?

Which bacterial structure functions primarily in attachment to surfaces?

Which of the following structures are found within prokaryotic cells?

Gram-negative bacteria have __________ peptidoglycan than gram-positive cells, and their cell walls are __________ complex structurally.

A gram-negative cell wall consists of __________.

Bacteria that __________ tend to have abundant internal membranes.

Bacterial flagella have a very complex structure composed of 42 distinct proteins. What is the most likely explanation for the evolution of these complex structures?