Question

Part A Which of the following statements accurately describes bacterial cell walls? In bacteria with acid-tast cell walls, the carboxylic acid in the walls forms a layer outside a thin layer of hydrophilic polypeptides. The cell walls of gram-negative bacteria contain many more layers of peptidoglycan than those of gram-positive bacteria. In gram-negative bacteria, the thin layer of peptidoglycan is surrounded by an outer membrane made of phospholipids, lipopolysaccharides, and proteins Gram-negative bacterial cell walls contain teichoic acids, whereas the cell walls of gram-positive bacteria do not Submit Request Answer Provide Feedback

Answer 1

answer (3)

the cell wall of gram negative has a single layer of peptidoglycan surrounded by outer membrane. The outer membrane of Gram-negative bacteria contains a unique component, lipopolysaccharide (LPS) in addition to proteins and phospholipids.

answer (1)

Psychrotrophs optimum growth temperature is 15 degrees to 38 degrees. Hence the growth wil be answer A. Highest growth.

answer (1)

an electrostatic attraction is formed , which is the ionic bond. The compound potassium fluoride (KF) has potassium and fluoride ions with equal but opposite charges.

answer (2)

Multiply of the number of cells with 10 is done to calculate the number of cells per mL of original culture. The value of 10^(plate number) is the dilution factor of the culture used to innoculate that plate.As there is no dilution multipication with 10 is done only once.