Parapatric speciation would be expected to occur most often
a. in the same homeland.
b. near a common border between two populations.
c. within a group of interbreeding populations.
d. across obvious geographical barriers.
e. by divergence from a common interbreeding population.
b
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An elderly man with chronic heart and lung disease develops Legionella pneumonia. By what route was the infection most likely to have been acquired?
a. Respiratory route, from an infected person b. Inhalation of aerosolized water from a source containing protozoa c. Inhalation of spores from moldy hay d. Exposure to livestock or animal products
The PCR technique doubles the amount of DNA in a sample in each cycle. If you started the PCR technique with two fragments of double-stranded DNA, calculate how many double-stranded DNA fragments you would you have after four cycles.
A. 16 B. 64 C. 32 D. 8
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.
A single type of receptor is responsible for detecting all tactile pressure in humans.
Answer the following statement true (T) or false (F)