*Bacterial cell walls are made of peptidoglycan that:

a. consist of linear polysaccharides that are cross linked bysimple sugars to form a ‘mesh like’ structure that maintains cellintegrity

b. consist of linear polysaccharides that are cross linked byshort polypeptide chains to form a ‘mesh like’ structure thatmaintains cell integrity

c. consist of linear polysaccharides that are cross linked byshort polypeptide chains to form a ‘mesh like’ structure thatpromotes the diffusion of nutrients into cells

d. None of the above

*Lipopolysaccharides (LPS) are found in:

a. Gram-positive bacteria

b. Gram-negative bacteria

c. all Bacteria

d. Archaea

e. Eukaryotes

*There are similarities and differences between Gram-negativeand Gram-positive bacteria. Which of the following is not true?

a. The cell wall of Gram-negative cells is composed of only oneor two layers of peptidoglycan whereas the cell walls ofGrampositive bacteria have many peptidoglycan layers

b. Only Gram-positive bacterial cells have a periplasm

c. The cell membranes of both Gram-negative and Gram-positivebacteria are lipid bilayers

d. There is a second membrane (called the outer membrane) justoutside the cell wall of Gram-negative bacteria, but this is absentfrom Gram-positive bacteria

*The cell membranes of Bacteria

a. serve as a barrier that separates the cell contents from theenvironment

b. prevent cells from bursting due to osmotic pressure

c. can be stained to distinguished Gram positive from Gramnegative bacteria

d. prevents the entry of organic compounds intocells.  

e. all of the above