The first step in the establishment of infection is that the organism must
A. invade host tissues.
B. attach to host cells.
C. evade phagocytes.
D. produce toxins.
B
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An unusual red sponge is discovered near a deep-sea vent. You want to determine if this is a new species of sponge, so you separate the cells for further study. A new lab assistant accidentally adds cells from a blue sponge to your preparation while you are at lunch. When you return, you find that the sponge cells have reaggregated into a multicellular organism. What do you see if the red and blue sponges are the different species?
A. one sponge with a red side and a blue side B. one blue sponge and one red sponge C. one sponge with blue and red randomly distributed D. one purple sponge (mix of red and blue colors) E. one sponge with alternating red and blue layers of cells
All the following are used to classify plankton except:
a. taxonomic groups. b. functional groups. c. life history. d. light spectrum requirements. e. size.
In domestic animals, “mad cow disease” is caused by:
a. Viruses b. Viroids c. Prions d. None of the above
Which of the following types of joints allows the LEAST amount of movement?
a. fibrous b. ball and socket c. hingelike d. synovial e. cartilaginous