Which of the following are even smaller than viruses?

A) chlamydias
B) prions and viroids
C) rickettsias
D) cyanobacteria


B) prions and viroids

Biology & Microbiology

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Which of the following statements is true?

a. There is no danger involved in recombinant DNA research in humans. b. There is no danger involved in recombinant DNA research in bacteria. c. There is no danger in releasing recombinant organisms into the environment. d. Stringent safety rules make the use of recombinant DNA research possible. e. None of these statements is true

Biology & Microbiology

As John walked outside the ballpark, a foul ball sailed over the fence and came straight at him. He saw it, and before he could think of what to do, he had reflexively jumped out of the way. What part of the brain saved John from a nasty bump?

A) hypothalamus B) pons C) medulla oblongata D) midbrain

Biology & Microbiology

Bacteria in the large intestine are able to manufacture

A) vitamin A. B) some minerals. C) vitamin C. D) vitamin K.

Biology & Microbiology

Infection in the bloodstream with Staphylococcus species can result in heart damage.

Answer the following statement true (T) or false (F)

Biology & Microbiology