Which of the three domains includes organisms that would be most likely to survive the environmental conditions that existed on Earth nearly 4 billion years ago?
A. Eukarya
B. Bacteria
C. Archaea
Answer: C
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An example of pathogen-associated molecular patterns (PAMP) is
A) cell-surface proteins. B) flagellin proteins. C) lipopolysaccharide (LPS). D) pilus.
Gram-positive bacteria have ____ and appear ____ under the microscope after Gram staining
a. thick cell walls; pink b. thick cell walls; purple c. thin cell walls; pink d. thin cell walls; purple e. thin cell walls; blue
The basic function of activated T cells is to battle
A) pathogens in blood or lymph. B) pathogens in interstitial fluid. C) pathogens that have already entered body cells. D) chemical mediators of immunity.
Which of the following weather conditions would you expect to have the greatest negative impact on the sexual reproduction of mosses and ferns?
A) excessively wet and rainy conditions B) above-average temperatures for a few days C) a long dry period D) cool, damp, and windy conditions