Which of the following statements about Gram positive/negative bacteria is true?

a) Gram-negative bacteria do not have peptidoglycan in their cell walls and stain blue to purple.
b) Gram-positive bacteria have a lot of peptidoglycan in their cell walls and stain blue to purple.
c) Gram-positive bacteria are a lot harder to kill with antibiotics because of their peptidoglycan layer.
d) Gram-positive bacteria weigh more than a gram.
e) Gram-negative bacteria have a thin cell wall and an additional outer layer with lipopolysaccharides.