Choose the best answer for the following questions.

1			All of the following are examples of microorganisms that are visible under light microscopes except:
			A)	bacteria
			B)	viruses
			C)	protozoa
			D)	yeast
2			The chemical test that distinguishes Streptococcus from Staphylococcus infections is the:
			A)	coagulase
			B)	culture
			C)	bacitracin
			D)	catalase
3			Which of the following microbes are rod-shaped bacteria?
			A)	Staphyloccus
			B)	Lactobacillus
			C)	Streptococcus
			D)	Giardia lamblia
4			In microscope examination of a Gram stain smear, dark blue spherical-shaped bacteria arranged in chains were observed. They are most likely:
			A)	Streptococcus
			B)	Staphylococcus
			C)	E. coli
			D)	rhinovirus
5			All of the following diseases are caused by viruses except:
			A)	common cold
			B)	herpes
			C)	infectious mononucleosis
			D)	syphilis