The stable presence of two or more phenotypes in a population is called a ____

a. balanced polymorphism
b. mixed gene pool
c. mutation pressure
d. population bottleneck
e. competitive advantage


ANSWER: a

Biology & Microbiology

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The same hormone has considerably different effects in different species. The hormone thyroxine in humans stimulates metabolism, but in frogs it induces metamorphosis from tadpole to adult frog. This indicates that

A. metamorphosis is caused by a change in body metabolism. B. the chemical composition of the hormone is actually slightly different. C. the origin of the hormone makes a difference in the effect the hormone has on target tissues. D. the target tissues have evolved different responses. E. the organisms have absolutely no evolutionary relationship.

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Many prokaryotes play vital roles in global nutrient cycles

a. true b. false

Biology & Microbiology

Enzymes that catalyze moving a phosphate from one substrate to another are called

A. ligases. B. aminotransferases. C. decarboxylases. D. oxidoreductases. E. phosphotransferases.

Biology & Microbiology

The experiment shown above demonstrates:

a. the inheritance of acquired characteristics. b. a selective disadvantage to mice with coats that match the color of their environment. c. a selective advantage to mice with coats that match the color of their environment. d. A and B. e. A and C.

Biology & Microbiology