The first vertebrates to develop jaws were the:

A) mammals. B) reptiles. C) amphibians. D) fish.


Answer: D

Biology & Microbiology

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In a segment of DNA, an A base is changed to a C and the error is copied during replication. Under which circumstances is that change considered a mutation? (Select all that apply.)

A) The change alters the phenotype of the organism's offspring. B) The change results in production of a novel protein. C) The change is in a somatic cell, such as a skin cell. D) The change is in a gene, but has no effect on a gene product or phenotype.

Biology & Microbiology

The first viroid was found in plants and was a

a. circular DNA surrounded by protein. b. circular RNA surrounded by protein. c. circular DNA with no protein coat. d. circular RNA with no protein coat. e. none of the above.

Biology & Microbiology

Anhidrotic ectodermal dysplasia is characterized by lack of normal ____________________ in the

skin. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Evolution is genetic change in __________ that occurs over time

a. an individual b. a population c. a community d. an ecosystem e. the biosphere

Biology & Microbiology