Why do lymph nodes often become swollen during an infection?
A. T cells reproduce in lymph nodes after being exposed to pathogens.
B. B cells reproduce in lymph nodes after being exposed to pathogens.
C. Macrophages move to lymph nodes after engulfing pathogens.
D. Cytotoxic T cells attack pathogens in the lymph nodes, triggering inflammation.
E. Vasodilation increases blood flow in the lymph nodes.
C. Macrophages move to lymph nodes after engulfing pathogens.
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In the above illustration of fluid regulation in an earthworm, the letter "B" represents which of the following?
a. the excretory pore b. the nephridium c. the storage bladder d. the ureter e. funnel to collect fluid
Human blood types involve all of the following except
A. ABO antigen markers. B. genetically determined glycoprotein markers. C. inheritance of two of three possible alleles. D. genes that code for an enzyme that adds a terminal carbohydrate to RBC receptors. E. MHC genes.
Which of the following types of animal virus requires RNA-dependent RNA transcriptase to be replicated?
A) +ssRNA viruses B) ssDNA viruses C) -ssRNA viruses D) retroviruses E) dsDNA viruses
How can Cytophaga and Flexibacter be distinguished in the laboratory?
a. by observing for gliding motility b. by comparing growth rate in acetate c. by scoring for growth on cellulose d. all of the above