11. Gram-negative bacterium is/are

A. Escherichia
B. Clostridia
C. Staphylococci
D. All of these

12. Thermus thermopiles is a

A. gram negative eubacteria
B. gram positive eubacteria
C. gram negative archebacteria
D. gram positive archebacteria

13. Which of the following is a gram-positive bacteria?

A. Lactobacillus
B. Staphylococci
C. Streptococci
D. All of these