A rapid method of sympatric speciation in plants is `
A) polyploidy.
B) genetic drift.
C) the sudden creation of a geographic barrier.
D) behavioral isolation.
Answer: A) polyploidy.
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Cytoplasmic inheritance refers to genes found in ____
a. sex chromosomes b. mitochondria and chloroplasts c. viruses d. bacteria e. linkages
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What will be an ideal response?
What is the primary reason that a hot spring will kill a fish placed in it but encourage the growth of certain bacteria?
A) The high temperatures destroy most of the fish's enzymes, but the specialized bacteria have enzymes adapted to these temperatures. B) Fish cannot feed directly on bacteria, but the bacteria can feed on dead fish. C) At hot spring temperatures, the metabolic activity of the fish's cells is so rapid that it runs out of food reserves and dies; the bacteria feed on the dead fish. D) Bacterial growth at high temperatures is so rapid that it deoxygenates the water and kills the fish.
Which of the following contributes to infection with Trichomonas vaginalis?
A) contact with contaminated fomites B) compromised immunity C) careless handwashing habits D) preexisting disease (chlamydia, for example) E) living in an undeveloped area of the world