Question

which shape describes a spherical bacterium?
vibrio
bacillus
spirillum
cocci
question 27 (1 point)
the outer membrane of gram - negative bacteria contains:
lipopolysaccharides
chitin
teichoic acids
sterols
question 28 (1 point) saved
which class of proteobacteria includes rickettsia, the causative agent of mountain spotted fever

Explanation:

• Spherical - shaped bacteria are called cocci. Vibrio are comma - shaped, bacillus are rod - shaped, and spirillum are spiral - shaped.
• The outer membrane of Gram - negative bacteria contains lipopolysaccharides. Chitin is in fungal cell walls, teichoic acids are in Gram - positive cell walls, and sterols are not a major component of Gram - negative outer membranes.

Answer:

• Question 1: D. Cocci
• Question 2: A. Lipopolysaccharides