Which of the following methods is not used to date fossils?
a. the amount of radioisotopes remaining
b. index fossils
c. the relative position in rock strata
d. uranium-235
e. nitrogen-14
E
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Chemolithotrophy involves
A) oxidation of organic compounds. B) oxidation of inorganic compounds. C) reduction of organic compounds. D) metabolic autotrophy.
What is the difference between a gene that is derepressed and one that is induced?
A. A gene that is derepressed is turned on because a repressor protein is not bound without its cofactor. By comparison, a gene that is induced is turned on because an inducer molecule prevents binding of the repressor. B. Genes that are derepressed are turned on because an inducer molecule is present. By comparison, a gene that is induced is turned on because a repressor protein is bound to the operator. C. There is no difference between a gene that is derepressed and one that is induced. D. A derepressed gene is turned off and an induced gene is activated to be expressed.
What is it called when the gene pool is fluxing because of the migration of individuals?
a. natural selection b. mutation c. gene flow d. genetic drift
A lateral line system supplements the ________ sense of hearing.
A. fish's B. snake's C. shrew's D. bird's E. whale's