The three membranes that enclose and protect
the central nervous system are the
a. cerebra.
b. meninges.
c. neuroglia.
d. adrenals.
e. ganglia
B
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A microbiology student with a visual disability is viewing a sample of Bacillus endospores in a phase contrast microscope that is linked to an iPad. By "stretching" the image on the iPad screen, the student can increase the apparent size of the endospores. How does this manipulation affect resolution and contrast? (No software is being used to alter the image!)
A. Resolution and magnification will decrease because the screen is not as good as the human eye. B. Only the magnification can be increased; resolution and contrast are unchanged. C. Both magnification and resolution increase; contrast is unchanged. D. Contrast will improve because the microscope is phase-contrast.
Which of the following is NOT involved in
self versus nonself recognition? a. complement b. MHC markers c. TCRs d. plasma membranes e. all of these are involved
Which of the following represents a difference between viruses and viroids?
A) Viruses infect many types of cells, whereas viroids infect only prokaryotic cells. B) Viruses have capsids composed of protein, whereas viroids have no capsids. C) Viruses have genomes composed of RNA, whereas viroids have genomes composed of DNA. D) Viruses cannot pass through plasmodesmata, whereas viroids can.
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