The amino acid glycine (C3NO2H6) is a(an):
A. element
B. organic molecule
C. inorganic molecule
D. vitamin
B
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The evolution of roots was an adaptive trait in early land plants because:
A. vascular tissue helps transport sugars. B. they allowed plants to absorb water from submersed stems. C. they allowed vascular plants to expand into drier habitats. D. they inhibit plants growing too tall. E. they reduce the rate of plant dispersal.
Select the false statement:a
Biomass reduction from one trophic level to the next is approximately 50 %. b. Biomass reduction from one trophic level to the next varies widely in nature. c. Biomass reduction can be measured as dry weight. d. Biomass may be measured as live weight. e. Biomass in an ecosystem can be illustrated using a pyramidal-shaped graph.
Enzymes that are expressed at a constant level all the time are said to be ________.
A. constitutive B. repressible C. attenuated D. inducible
A protein that regulates transcription by binding to the operator is known as the
A. repressor. B. CAP. C. operator. D. operon. E. promoter.