What is the function of macrophages during infection by a pathogen?
A. to kill the pathogen by directly damaging its cell membrane
B. to phagocytize the pathogen
C. to produce antibodies
D. all of the above
Answer: B. to phagocytize the pathogen
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Flowers may develop from a(n):
A. apical meristem. B. leaf meristem. C. branch meristem. D. lateral meristem.
What would be an easy way to determine if a skull is a mammal's skull?
A. Look for air sacs in the skull. B. Examine the teeth. C. Look for the remains of the tympanum. D. Measure the brain case volume.
Which of the following is NOT an example of a prezygotic isolating mechanism?
a. An iris blooms at a different time of the year than a daffodil. b. A peacock puts on a different mating display than a sparrow. c. A snail with a shell coiling in one direction cannot mate with a snail whose shell curls the other way. d. A zebroid is sterile. e. One type of roundworm would reject the sperm from another species of roundworm.
Which category of plant second metabolites includes stimulants like caffeine, nicotine, and cocaine?
A. alkaloids B. phenolics C. tannins D. terpenes E. cyanogenic glycosides