The woody plant genus Frankia produces root nodules that harbor
a. actinobacteria
b. rhizobium
c. fungi
d. green algae
e. aktinites
Answer: a. actinobacteria
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Adult stem cells can only differentiate into the cell types that comprise the tissues in which they are located
a. True b. False
Which of the following is NOT part of the plant
shoot system? a. stems b. roots c. flowers d. leaves e. all of these are parts of the shoot system
The receptors in the respiratory center are most sensitive to a small
A) increase in blood carbon dioxide levels. B) increase in blood oxygen levels. C) decrease in blood nitrogen levels. D) decrease in blood oxygen levels. E) increase in blood pH.
Which of the following statements regarding the demonstration of the etiology of disease is FALSE?
A) The suspect agent must be present in all cases of disease. B) The suspect agent must cause the disease under investigation when introduced into a susceptible host organism. C) The suspect agent must be isolated and cultured in the laboratory. D) It must be possible to reisolate the suspect agent from the infected experimental host. E) The suspect agent must be the only potential pathogen present in disease cases.