Several infections of the cardiovascular system can be identified by inspecting a stained blood smear in the microscope. For the following infections, identify the microscope observation that does not fit the disease.
A. Chagas disease; protozoan visible among blood cells
B. Malaria; ring trophozoites visible inside red blood cells
C. Epstein-Barr virus; virus visible inside red blood cells
D. Babesiosis; protozoan visible inside red blood cells
Answer: C
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Ricin is toxic because it
a. binds to eukaryotic DNA. b. binds to eukaryotic mRNA. c. blocks food from entering the cell. d. inactivates ribosomes. e. binds to nerve tissue and causes paralysis.
According to astronomers, the universe is
a. contracting. b. getting warmer. c. the same as it was on the day of creation. d. collapsing. e. expanding.
You are examining a rigid plant tissue; it does not flex or bend. Tests show that it is not consuming oxygen gas, as would be expected if aerobic respiration were occurring. This tissue is probably
A) collenchyma. B) phloem. C) epidermis. D) sclerenchyma. E) parenchyma.
Which of the following is not considered a microorganism?
A. mosquito B. protozoan C. bacterium D. virus E. fungus