Explain how gibberellin “removes the brakes” from some cellular processes What will be an ideal response?
ANSWER: Gibberellin works by inhibiting inhibitors, thus removing the brakes on some cellular
processes. Binding to a gibberellin receptor sets in motion the destruction of transcription
repressors in the nucleus. The genes that these proteins repress are still being studied, but
their products have overlapping functions involving cell proliferation and expansion, fertility,
and germination.
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What has led to the near elimination of kelp forests on the coasts of the United States? a. The overfishing of American lobster and cod
b. All of these choices. c. The increase of sea urchin populations. d. The decline in sea otter population.
The order of whorls from the flower's periphery to the center is:
a. sepals, petals, stamens, and carpels. b. carpels, petals, stamens, and sepals. c. petals, carpels, stamens, and sepals. d. sepals, carpels, stamens, and calyx. e. calyx, carpels, stamens, and sepals.
What is the fate of metabolites during respiration?
a. They are oxidized completely to carbon dioxide and water. b. They are reduced to from NADH and FADH2. c. They are oxidized completely to form pyruvic acid. d. They are rearranged to form GTP.
All of the following influenced Darwin as he synthesized the theory of evolution by natural selection except _________.
A. the biogeographic distribution of species such as the mockingbirds on the Galapagos Islands B. Lyell's book Principles of Geology on the gradualness of geologic changes C. examples of artificial selection that produce rapid changes in domesticated species D. Linnaeus's hierarchical classification of species which could be interpreted as evidence of evolutionary relationships E. Mendel's paper in which he described his "laws of inheritance"