Question

1. which of the following is true of most bacteria? a. they are contagious. b. they are nonpathogenic. c. they are pathogenic. d. they are deadly. 24. a microorganism is any _. a. infectious organism b. plant - based organism c. living organism d. organism of microscopic size 25. there are _ of different kinds of bacteria, which fall into ___ primary type(s). a. hundreds; three b. millions; one c. thousands; two d. dozens; four

Explanation:

• For question 23: Most bacteria are non - pathogenic. Only a small fraction are pathogenic, contagious or deadly.
• For question 24: A microorganism is defined as an organism of microscopic size. Not all are infectious.
• For question 25: There are thousands of different kinds of bacteria which fall into two primary types (e.g., gram - positive and gram - negative).

Answer:

1. b. They are nonpathogenic.
2. d. organism of microscopic size
3. c. thousands; two