Keratin is an important aspect of nonspecific defense because it
A. is toxic to pathogens.
B. creates a physical barrier against pathogens.
C. physically restricts pathogens to a specific region.
D. destroys pathogens.
Answer: B
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Which of these methods can identify bacteria in a sample without culturing the bacteria?
a. flow cytometry b. biochemical testing c. fluorescent in situ hybridization (FISH) d. phage typing e. flow cytometry and fluorescent in situ hybridization (FISH)
When grouping organisms, which classification is most general for a particular type of organism?
A. Kingdom B. Phylum C. Order D. Family E. Species
Lignin is not found in stems of _____________
a. mosses c. monocots b. ferns d. a and b
The carbon atoms in cellulose found in a log originally came from absorbed by the plant.
A. glucose in the roots, B. oxygen in the atmosphere, C. water in the soil, D. carbon dioxide in the air, E. nutrients in the soil,