Gross primary productivity refers to the total
a. quantity of solar energy available to the
ecosystem in a given period of time.
b. quantity of solar energy reaching a given area of
the ecosystem.
c. energy trapped initially by the producers.
d. energy used by the heterotrophs of the
ecosystem in a given period of time.
e. energy used by the producers for their growth
and reproduction.
Answer: c
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Hoogsteen base pairing:
A. can result in the formation of a tetraplex DNA from stretches of G residues. B. causes additional paring of an A to an existing A-T pair such that the T is bound to both Abases. C. can result in triplex DNA formation in stretches of DNA containing alternating purines and pyrimidines. D. results in triplex DNA in which all three strands are composed of purines only. E. can result in the formation of triplex DNA within long sequences containing only pyrimidines or only purines in a given strand.
Four of the five viruses listed below are enveloped in
membrane from the host cell. Select the exception. a. adenoviruses b. influenzaviruses c. herpesviruses d. smallpox virus e. virus that causes AIDS
Which of the following is NOT true concerning
Pangaea? a. It formed during the Permian. b. Gymnosperms flourished on Pangaea c. It caused climates to become warmer and wetter. d. It began to break apart during the Jurassic. e. Plant diversity expanded on its isolated fragments during and after the Jurassic.
Asexual reproduction differs from sexual reproduction in that
What will be an ideal response?