A motor unit is
a. a single muscle fiber activated by one neuron.
b. the complete set of muscle fibers in a single muscle.
c. a single sarcomere.
d. a single muscle fiber activated by many neurons.
e. a group of muscle fibers activated by one neuron.
E
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Regulatory transcription factors _____
A) influence the binding of sigma factor to DNA B) influence the assembly of the basal transcription complex C) influence the degree of unwinding of DNA at the promoter D) open the two strands of DNA so that RNA polymerase can begin transcription
A seed that lands in the forest soil is homozygous mutant for the CONSTANS (CO) gene, and as a result does not produce any functional CONSTANS protein. What do you predict will happen during the development of this seed?
A. It will germinate and grow vegetatively, but will never produce flowers. B. It will fail to germinate. C. It will germinate and grow vegetatively, and then it will produce flowers earlier than wildtype. D. It will germinate and grow vegetatively. If it is from a photoperiodic species, it will fail to produce flowers. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the CONSTANS gene? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Persons with heartburn may have problems with their
a. pyloric sphincter. b. bursa of Fabricius. c. cardiac sphincter. d. Peyer's patches. e. choane.
The main site of food absorption in the human digestive system is the
A. stomach. B. esophagus. C. small intestine. D. large intestine. E. rectum.