In experiments to show that DNA is the genetic material, Hershey and Chase labeled DNA with radioactive
A) amino acids.
B) sulfur.
C) phosphorus.
D) carbon.
C) phosphorus.
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The embryonic germ layer of tissue in animals that develops into the muscles and reproductive system is the
A. ectoderm. B. protoderm. C. pachyderm. D. endoderm. E. mesoderm.
The sea heats and cools
A. three times a day. B. more quickly than the land and more slowly than the land. C. more quickly than the land. D. more slowly than the land. E. at the same rate as the land.
The phenomenon known as chemotaxis is defined as
A. the squeezing of cells through the lining of capillaries. B. the release of prostaglandins and leukotrienes in response to microbes. C. the movement of a cell toward or away from a chemical stimulus. D. the coating of a pathogen by complement. E. an increase in allergies and helminth infection.
In this phylogeny, the P species are from the Pacific side and the C species are from the Caribbean side of the Isthmus of Panama. What is the most likely cause of speciation?
a. sympatric speciation b. parapatric speciation c. allopatric speciation via dispersal across the Isthmus of Panama d. allopatric speciation via isolation when the Isthmus of Panama closed