Which of the following is the best definition of sympatric speciation?
a. species that evolve due to geographical distance
b. mechanical isolation acts to prevent speciation
c. breeding behavior that prevents the organisms from breeding due to differences in their breeding time
d. ecological isolation
e. divergence within a population leads to speciation in the absence of a physical barrier to gene flow.
ANSWER: e
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The alternative pathways of photosynthesis using the C4 or CAM systems are said to be compromises. Why?
A) Each one minimizes both water loss and rate of photosynthesis. B) C4 compromises on water loss and CAM compromises on photorespiration. C) Both minimize photorespiration but expend more ATP during carbon fixation. D) CAM plants allow more water loss, while C4 plants allow less CO2 into the plant. E) C4 plants allow less water loss, but CAM plants allow more water loss.
Which of the following is a water-soluble vitamin?
A) A B) C C) D D) E E) K
The evidence for industrial melanism being caused by an increase in the dark allele was provided from field tests carried out by
A. Lamarck. B. Wallace. C. Darwin. D. Kettlewell. E. Tutt.
For heart muscles to beat in a coordinated rhythm ions must move from one cell to the next through
A. hemidesmosomes. B. adherens junctions. C. desmosomes. D. gap junctions. E. focal adhesions.