Which type of modified stems are typical of plants that historically have needed to protect themselves from mammalian herbivores?
A) blades
B) tubers
C) stolons
D) thorns
E) rhizomes
Answer: D
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Which cell does NOT belong with the others?
a. erythrocytes b. neutrophils c. lymphocytes d. eosinophils e. macrophages
Which of the following is NOT a function of a macrophage?
A) To engulf pathogens. B) To produce an antibody. C) To present pathogens. D) To digest pathogens. E) To activate T-lymphocytes.
A laboratory recipe lists sucrose, an ammonia compound, calcium salts and a buffer as the ingredients for a microbiologic medium. These are added to water and autoclaved. What type of medium does this protocol produce?
A) defined agar B) defined broth C) complex broth D) reducing agar E) complex enrichment broth
Sulfur dioxide is added to "must" in the production of wine to
A) improve the flavor. B) allow more control over the fermentation process. C) provide a necessary nutrient for the fermentation process. D) prevent tannins from leaching out of wood into the fermenting wine. E) both enhance flavor and promote fermentation.