Some pathogens must spread from their initial site of entry because their target tissue is a distance from their entry portal

a. true
b. false


a. true

Biology & Microbiology

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Human blood groups are determined by antigens on the surface of red blood cells

Indicate whether the statement is true or false

Biology & Microbiology

How did researchers establish the connection between chimpanzees and humans? How did researchers establish the connection between chimpanzees and humans?

Biology & Microbiology

The experimental design in Figure 13-1 was used to examine:


a. the relationship between genetic changes and metabolic enzymes.
b. the mutation rate of Neurospora.
c. resistance of Neurospora to genetic poisons.
d. toxicity of arginine metabolites.
e. growth of Neurospora in the presence of different antibiotics.

Biology & Microbiology

Name the structure and organ of the digestive tract that contain microvilli and absorb nutrients.

a) villus, large intestine b) folds, stomach c) pyloric sphincter, appendix d) villus, stomach e) villus, small intestine

Biology & Microbiology