________ produces short sequences of RNA, which allows polymerase to synthesize a new strand of DNA.

A. DNA primase.
B. DNA helicase.
C. DNA polymerase.
D. DNA topoisomerase.
E. DNA ligase.


A. DNA primase.

Biology & Microbiology

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A mass extinction is defined as

a. the permanent loss of major groups of organisms. b. the loss of 20% of a population. c. the rapid growth of species diversity in a particular area. d. the temporary loss of major groups of organisms. e. all of these.

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Serological testing always involves reactions between specific antibody and antigen.

a. true b. false

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The spinal cord runs through, and is protected by, the __________.

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

Biology & Microbiology

The massive early jawed fishes were called

A. placoderms. B. coelacanths. C. lampreys. D. whales.

Biology & Microbiology