Why is the paroxysmal stage of Pertussis so long?
A. It takes a while for our immune system to fight the pathogen
B. It takes time for the many cells in our respiratory tract to die and fall off
C. It takes time for the toxin to work
D. Our cough ‘trigger’ in our brain has to get reset
E. A and B
F. All of the above
Answer: B. It takes time for the many cells in our respiratory tract to die and fall off
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Fungal cell walls contain:
a. lignin b. chitin c. cellulose d. glycogen e. keratin
If a mutation prevented the formation of lignin, what tissue would be most affected?
a. vascular cambium b. collenchyma c. phloem d. sclerenchyma e. parenchyma
This is a mating pair of parrots. You would expect them to be:
a) monogamous and sexually dimorphic. b) monogamous and sexually monomorphic. c) polygamous and sexually monomorphic. d) polygamous and sexually dimorphic. e) monogamous and the female making the nest and caring for the young.
Which of the following is a function of the glycocalyx?
A) to aid in adhering to the cell's environment B) to aid in preventing phagocytosis from cells that might engulf the bacterium C) formation of biofilms D) all of the above