44. Transduction of bacteria is mediated by (A) sex pilus (B) plasmid (C) bacteriophage (D) conjugation

47. Which of the following about Gram-positive and Gram-negative bacteria is True? (A) Gram-negative bacteria have more peptidoglycan in their cell walls. (B) Gram-positive bacteria have fimbriae but Gram-negative bacteria do not. (C) certain bacteria are not Gram-positive or Gram-negative. (D) endotoxin exists in Gram-positive bacteria but not Gram-negative bacteria