________ is a new technique that has facilitated cell cycle studies.
Fill in the blank(s) with the appropriate word(s).
Flow cytometry
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These birds resemble each other, but live in vastly different geographic areas. What is their evolutionary relationship?
1.They cannot be related if they lived on different continents.
2.They are vestigial forms of one another.
3.They resemble each other outwardly but are very different internally.
4.They all had a common ancestor.
Speciation has become complete when
A) two populations of organisms have been separated for a very long time. B) a change in allele frequency has occurred. C) organisms of one population do not recognize the mating call of another population and so mating does not occur. D) offspring of mating from members of two different populations are able to mate with members of either population.
Which is a function of the nasal cavities in humans?
A) secreting enzymes for digestion B) warming inhaled air C) secreting excess carbon dioxide into exhaled air D) determining O2 content in inhaled air
Scientists unearth a Wooly Mammoth from the Siberian Ice Sheath and discover that a eukaryotic "amoeba"-like cell is still alive. Which component of the cell membrane might contribute to maintaining the fluidity of plasma membranes under freezing conditions?
A. high levels of saturated phospholipid tails within the lipid bilayer B. high levels of long phospholipid tails within the lipid bilayer C. absence of cholesterol D. high levels of unsaturated phospholipid tails within the lipid bilayer E. peripheral proteins