Figure 40.5B
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Use the figure above showing the structure of the human kidney to answer the following question.
Fluid is reabsorbed from peritubular capillaries and returned to blood circulation via the structure indicated by the letter ____.
A. A
B. B
C. C
D. D
E. E
Answer: D
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With regard to translation in prokaryotes, the gene products are often encoded on polycistronic mRNAs. As a result, the quantities of each of the proteins are often graded, such that the first gene has a great deal of protein translated, whereas the last gene has very little. Which of the following features of prokaryotic translation may account for increased production of some products and
decreased production of others? A) The different messages have sequences with more or less homology to the Shine?Delgarno sequence; fewer ribosomes binding results in less product. B) Feedback regulation of ribosomes tells the cell that enough product is made, and ribosomes from such mRNAs dissociate. C) Because transcription and translation in prokaryotes are essentially coupled, there is no gradation in the amount of individual proteins made from a polycistronic message. D) There is no termination sequence at the end of each gene, so one long protein is made, resulting in equal amounts of products. E) all of the above
Which molecule is believed to have preceded the other three during the evolution of life?
A. DNA B. ATP C. Proteins D. RNA
What is the name of the muscle that helps move air in and out of the lungs?
A) trachea B) alveolus C) diaphragm D) bronchus
The figure above documents the:
a. increase in homozygosity with time. b. the effect of over-fishing on heterozygosity. c. the decline of heterozygosity with time. d. B and C. e. All of the above.