Evolution by genetic drift is most obvious in:
A) invertebrate species. B) aquatic populations.
C) small populations. D) migratory species.
Answer: C
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The coding region of mRNA is called a(n) ; ____ , whereas the noncoding region is called an ____
Fill in the blank with the appropriate word.
Davis, Weintraub, and Lasser found three genes that are involved in muscle differentiation by
A. eliminating all the gene candidates that were expressed in both muscle and nonmuscle cells. B. finding all the genes that were expressed in common between two different muscle cell lines. C. cloning all the genes that were expressed in muscle cell lines to determine if any of these genes could cause nonmuscle cells to differentiate into muscle cells. D. mutating genes expressed only in muscle cells to see if differentiation could be prevented.
A 100 ml sample of water is filtered through a sterile membrane, and the membrane is transferred to a plate of m-Endo agar. Following overnight incubation at 37°C, 57 green metallic colonies appear. The coliform count is
A. acceptable for drinking water and recreational use. B. too high for both drinking water and recreational use. C. acceptable for recreational use but too high for drinking water.
GTPase activity is involved in the regulation of signal transduction because it
A) increases the available concentration of phosphate. B) decreases the amount of G protein in the membrane. C) hydrolyzes GTP binding to G protein. D) converts cGMP to GTP. E) phosphorylates protein kinases.