The concept of an ecosystem differs from that
of a community in that, unlike the community,
the ecosystem includes the
a. producers.
b. decomposers.
c. physical environmental factors.
d. animals as well as the plants.
e. parasites.
C
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A butterfly of genotype CCdd is crossed to ccDD and the F1 testcrossed to ccdd. If the genes are
linked and 30cM apart, what fraction of the F2 offspring should be ccdd?
a. 15% b. 30% c. 50% d. 70% e. 85%
If the rate of photosynthesis stops increasing, at what concentration of CO2 does it stop increasing?
a. between 100 and 300 ppm b. between 300 and 500 ppm c. between 500 and 700 ppm d. between 700 and 900 ppm
Which of the following is involved in proofreading during DNA replication?
A) 5' to 3' exonuclease activity of DNA polymerase B) 3' to 5' exonuclease activity of DNA polymerase C) 5' to 3' endonuclease activity of DNA polymerase D) 3' to 5' endonuclease activity of DNA polymerase E) RNA polymerase
What are spiracles?
A) Openings between the gills of a frog tadpole B) Openings to the parabronchi C) Openings into the tracheae of insects D) Openings to the bronchi E) Openings into the alveoli of the lungs