Question

17) Peptidoglycan is a polymer consisting of the following chemical constituents (1 pts) ON-acetyglucosamine (AGA), N-acetylmuramic acid, and a peptide chain ON-AGA, N-AMA, teichoic acid A-AGA, lipopolysaccharides, and peptide chain ON-AMA, lipoproteins, and techoic acid Oprotein, teichooic acid, and diaminopimelic acid 18) Which of the following statements regarding gram-positive cell walls is/are true? i. They are more susceptible to penicillin than are gram-negative cells. ii. They contain a higher percentage of peptidoglycans than do gram-negative cells. iii. Because the mordant attaches the primary dye to the peptidoglycan the gram-positive cells wall do not decolorize easily with organic solvents (e. g., acetone-alcohol) during the gram straining process. iv. The are more resistant to physical disruption than are gram-negative cell walls. Statements i, ii, and ii are true Statements i and ii are ture O Statements il and iv are true O Statement iv is true All of the above are true (1 pts) 19) Which of the following statements is/are true? i. Mesosomes function in cell wall synthesis and the division of nuclear material. ii. The chromatinic area of the cytoplasm is rich in DNA ili. The chromatic area of the cytoplasm is associated with the mesosoma. iv. The bacterial genome possesses one discrete double-stranded circular chromosome. O Statements i, il and ill are correct O Statements i and iliare correct Statements ii and ivare correct O Statement iv is correct All of the above are correct

20.) The term spheroplast applies to a gram-negative bacterial cell which .......?

A.) is likely to lyse due to the osmosis shock

b.) is just about to ready to produce a spore

c.) is fighting off an infection by becteriophages

d.) has lost its peptidoglycan layer of the cell wall

e.) is lacking a cell wall

Answer 1

17) Peptidoglycan is a polymer consitting of N-acetyl glucosamine , N-acetyl mwramic acid peptide chain and Nacetyl muramic Explanation Peptidoglycan cconsist of two joined amino Sugars N acetylglucos osamine and acid with pentapeptide chain 9t is heteropolymere and also known muren and as Option A correct. incorrect are while B, C, D, e with Characteristics peptidoglycan Jonot match