The specificity of viruses to different types of cells is due to ____ sites on the host cell
a. prophage
b. receptor
c. transduction
d. penetration
e. transcription
b
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Bryophytes are able to actively control their hydration
A. true B. false
Neurons that carry messages from the CNS to effectors are
a. sensory. b. motor. c. interneurons. d. both a and b.
A plant physiologist treats a leaf with abscisic acid and observes that the stomata close. What happened inside the guard cells during the experiment?
A. Abscisic acid influences the movement of sodium ions out of the guard cells. B. Abscisic acid causes the guard cells to become more turgid. C. Abscisic acid influences the movement of potassium ions out of the guard cells. D. Abscisic acid binds with auxins and induces water molecules to exit the guard cells. E. Abscisic acid binds carbon dioxide and causes carbonate crystals to block the stomatal opening.
Which of the following contribute(s) to the spread of Legionella pneumophila in domestic water systems?
a. biofilm formation b. heat resistance c. resistance to chlorine d. all of the above