A type of symbiosis in which both species benefit is
A. intraspecific competition.
B. mutualism.
C. predation.
D. parasitism.
E. commensalism.
B. mutualism.
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Which of the following statements concerning conjugation pili is FALSE?
A) Pili are longer than fimbriae and flagella. B) Pili facilitate the transfer of DNA among bacterial cells. C) Pili are long, hollow tubules. D) Not all bacteria have pili. E) A bacterial cell will usually have only one or two pili.
Acid-fast smears should be examined carefully by scanning at least ________ oil immersion fields
a. 100 b. 200 c. 300 d. 400
After a forceful exhalation of the maximum volume possible, what volume of air must be inhaled to resume normal breathing?
a. vital capacity b. functional residual capacity c. tidal volume + expiratory reserve volume d. inspiratory reserve volume + tidal volume
The maternal effect bicoid protein is a transcription factor that binds to the promoter of a zygotic gene to activate its expression. What is this second gene?
What will be an ideal response?