The most significant role played by pH buffers is to
A. prevent fluctuations in the acidity of solutions.
B. increase the strength of acids and bases.
C. prevent fluctuations in the salinity of solutions.
D. limit major shifts in the amount of H+ and OH- in solution.
E. keep pH low.
D. limit major shifts in the amount of H+ and OH- in solution.
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Glycolysis is a metabolic process that is done by all cells. However, not all cells make use of another metabolic process called the Krebs cycle. What does this tell you about the evolution of these processes?
A. As a metabolic process, glycolysis likely evolved prior to the Krebs cycle B. As a metabolic process, the Krebs cycle likely evolved prior to glycolysis C. Both the Krebs cycle and glycolysis likely evolved at the same time 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 evolution and time? What other information is related to the question? Choose Answer Do you have all necessary information to determine the relative importance of glycolysis and the Kreb’s cycle? 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?
Szostak and colleagues found that a ribozyme found in the human genome was related to a similar enzyme in human
hepatitis delta virus (HDV). In order to identify this ribozyme, they: A. searched the published human genome sequence for HDV sequences. B. searched the published human genome sequence for ribozyme sequences. C. incubated HDV RNA and evaluated the sample for ribozyme activity. D. incubated human RNA and evaluated the sample for ribozyme activity.
The chance that a future event will occur is called ____________
A. Probability B. Goodness of fit C. Degrees of freedom D. Random selection E. All of the answers are correct
Based on the Luria–Delbrück experiment, mutations that provide plants with the ability to survive on toxic soils should occur:
a. only in populations living on toxic soils. b. in all plant populations. c. randomly. d. A and B. e. B and C.