Gram negative vs. Gram positive Bacteria

What gives bacteria strength and rigidity?

• Proteins

• Polysaccharides

• Nucleic acids

• Lipids

What is the process by which solvent molecules pass through a semipermeable membrane from a less concentrated solution to a more concentrated one?

• Endocytosis

• Diffusion

• Osmosis

• Active transport

What is the polymer made up of sugars and amino acids which forms a mesh in bacterial cell walls?

• Peptidoglycan

• Chitin

• Glycogen

• Cellulose

How many layers of peptidoglycan are present in the cell wall of gram-positive bacteria?

• 1

• 10

• 20

• 30

What is the name of the dye used to differentiate between gram-positive and gram-negative bacteria?

• Methylene blue

• Eosin

• Crystal violet

• Safranin

What is the chief difference between gram-positive and gram-negative bacteria?

• Cell shape

• Cell size

• Cell wall structure

• Cell membrane composition

Why do gram-negative bacteria not retain the crystal violet dye during the Gram stain test?

• They have a thick peptidoglycan layer

• They have an outer membrane

• They lack a cell membrane

• They lack a cytoplasm