A group of functionally related genes transcribed as a single transcriptional unit under the control of a single promoter is referred to as a(n) ____
What's the answer this? Thanks.
Answer: operon
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The key chemical messenger responsible for increasing cardiac output when animals are exercising or under certain stresses is
A. epinephrine. B. acetylcholine. C. dopamine. D. serotonin. E. glutamate.
According to the diversity-stability hypothesis:
A. Genetic diversity is the most important part of ecosystem stability. B. A loss of any species from an ecosystem leads to an approximately equal decline in stability. C. The loss of a few species from an ecosystem does significantly affect ecosystem functioning. D. Losing even a few species from an ecosystem causes a drastic decline in ecosystem stability. E. Every species has an important role in ecosystem function, but we cannot predict the effect of species loss.
Which of the following is NOT classified as an ectoparasite?
a. aphids b. bedbugs c. leeches d. mosquitoes e. tapeworm
In 1785, the theory of uniformitarianism was proposed by
A. James Hutton. B. Georges-Louis Buffon. C. Charles Darwin. D. Georges Cuvier. E. Charles Lyell.