Male peacocks having more ornate plumage than their female counterparts is an example of which of the following features of ecological behavior?
a. monogamy
b. sexual dimorphism
c. sexual selection
d. territoriality
Ans: b. sexual dimorphism
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How are the zygote and the dikaryotic stages of a fungal life cycle related?
A. The dikaryotic stage gives rise to the zygote through karyogamy. B. The dikaryotic stage and zygote stage are both diploid. C. The zygote stage gives rise to the dikaryotic stage through plasmogamy. D. The dikaryotic stage and zygote stage occur only in asexual life cycles. E. The zygote stage gives rise to the dikaryotic stage through meiosis.
The barrier between the intracellular and extracellular fluid compartments in an animal or plant is the:
A. plasma membrane. B. walls of capillaries. C. nuclear membrane. D. membrane of the endoplasmic reticulum. E. membrane of the Golgi apparatus.
Most bacterial cells can keep from bursting in a hypotonic environment because of:
a. a stiff capsule. b. a rigid cell wall. c. a tough cell membrane. d. an efficient water pump. e. pumping large quantities of salts into the cell.
Both fish and humans develop neurological symptoms and bloody skin lesions due to a sudden "bloom" of this algae.
A. diatoms B. Prototheca C. Phaeophyta D. Pfiesteria piscicida E. All of these choices are correct.