In the context of recombinant DNA technology, what is meant by the term vector?
What will be an ideal response?
A vector is a vehicle to carry recombinant DNA molecules into the host cells where independent replication can occur. Most common vectors are plasmids, bacteriophages, and cosmids.
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Glucose is converted into glucose 6-phosphate by hexokinase. Glucose 6-phosphate then serves as the substrate for the enzyme phosphoglucose isomerase, which converts this reactant into fructose 6-phosphate. Fructose 6-phosphate serves as the substrate for phosphofructokinase, which converts fructose 6-phosphate into fructose 1,6-bisphosphate. Based on the information provided, this is an example of what?
A. Feedback inhibition B. Allosteric regulation C. A metabolic pathway D. Enzyme inhibition
X chromosome inactivation is caused by the accumulation of:
A. proteins produced by the Xist gene; these proteins induce methylation, histone modification, and other changes associated with preventing transcription. B. coding RNA produced by the Xist gene; this RNA, in addition to coding for Xist proteins, binds to and coats the X chromosome undergoing inactivation and physically prevents it from being transcribed. C. non-coding RNA produced by the Xist gene, which coats the X chromosome and physically prevents it from being unwound, "unzipped," and transcribed. D. non-coding RNA produced by the Xist gene, which coats the X chromosome and induces methylation, histone modification, and other changes associated with preventing transcription. E. None of these choices accurately describe the process of X chromosome inactivation.
The anaerobic organisms used in sewage treatment may produce the useful product(s)
A. oxygen. B. nitrogen. C. carbon monoxide. D. methane. E. nitrogen AND carbon monoxide.
What is a criticism of the hydrothermal vent origin of life theory?
a. Hydrothermal vents are too hot and would have destroyed the organic molecules even as they formed. b. Hydrothermal vents are too salty and would have destroyed the organic molecules even as they formed. c. Hydrothermal vents are unstable in general and would have dissipated the organic molecules. d. Hydrothermal vents lack sufficient oxygen for the evolution of aerobic organisms. e. Hydrothermal vents contain too many dissolved mineral ions.