64.Which of the following statements is correct about Gram-negative bacteria?
(A)Penicillins are effective antibiotics against them.
(B)They often possess an outer cell membrane containing toxic lipopolysaccharides.
(C)On cell-to-cell basis, they possess more DNA than the cells of any taxonomically higher organism do.
(D)Their chromosomes are composed of DNA tightly wrapped around hi stone protein.
(E)Their cell walls are primarily composed of peptidoglycan.