A single covalent chemical bond represents a sharing of ________ electrons between two atoms
Fill in the blank(s) with correct word
two
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Some transcriptional repressors work by ____
a. binding to the same sequence where activators normally bind b. binding to and disabling the activator c. recruiting histone acetylation enzymes and thus interfering with chromatin remodeling d. binding to RNA polymerase II and preventing it from binding to the transcription factor complex e. methylating DNA
In the figure above, which number identifies the structure of cones or rods that will respond to
wavelengths of RED light ONLY?
a. 3 b. 4 c. 5 d. 6 e. 7
There are more insect species per square kilometer in
a Brazilian rainforest than there are in a redwood forest of the Pacific Northwest of the United States. An explanation for this finding is that a. the tropics have conditions that more species can tolerate. b. species richness may be self-reinforcing. c. tropical communities have been evolving for a longer time than temperate ones. d. the tropics have conditions that more species can tolerate. and species richness may be selfreinforcing. e. the tropics conditions that more species can tolerate, species richness may be selfreinforcing, and tropical communities have been evolving for a longer time than temperate ones.
To replace fossil fuels, the world must find a way of producing fuel from renewable energy. One of the most promising fuels of the future is hydrogen, which could potentially be produced in algae using the power of sunlight. Green algae contain enzymes (hydrogenases) that can convert hydrogen ions (H+) and electrons to hydrogen gas (H2). The hydrogen ions used by the hydrogenase come from
A. organic sugars. B. ATP. C. rubisco. D. ATP synthase. E. water.