Temporal isolation of a species is an example of
1.a prezygotic barrier.
2.a postzygotic barrier.
3.genetic drift.
4.founder effect.
5.gene flow.
1
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In this figure showing SDS-PAGE of the progressive stages of glycine N-methyltransferase purification, the 14,000 MW protein most likely disappears from the sample because gel-exclusion chromatography differentiates proteins by:
A. charge-to-mass ratio. B. mass. C. charge. D. solubility. E. specific affinity to resin.
Which of the following describes the order of emergence of various organisms on Earth?
a. land plants, first prokaryotes, animals, first eukaryotes, humans b. first prokaryotes, first eukaryotes, land plants, animals, humans c. animals, first prokaryotes, first eukaryotes, land plants, humans d. humans, animals, land plants, first eukaryotes, first prokaryotes
Which of the following cells engulf antigens and present fragments of them on their own surfaces for recognition?
a. plasma cells b. T lymphocytes c. NK cells d. dendritic cells
Stratification refers to the extended exposure to ________ that is required for some seeds to germinate.
A. high relative humidity B. low temperatures C. short daylengths D. long wavelengths of light E. clay soil particles