Antibiotics incorporated into the culture medium can ________.
A. select against organisms that have not incorporated the plasmid and select against organisms that have incorporated a plasmid not containing the desired gene
B. select against organisms that have not incorporated the plasmid
C. enhance production of recombinant proteins
D. select against organisms that have incorporated a plasmid not containing the desired gene
Answer: B
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Sexual reproduction:
A. results in offspring that are not genetically identical. B. results from combining genetic material from two gametes. C. results in a new generation that is not genetically identical to its parents. D. results in a new generation with the same number of chromosomes as the parents. E. All of these choices are correct.
Summarize the arguments both for and against irradiating foods
What will be an ideal response?
Stable isotope analysis to indicate whether or not certain elements have been processed by an organism is based on the observation that
A. microbes generally prefer using the lighter of two stable isotopes. B. microbes have no preference as regards heavy versus light isotopes. C. microbes generally prefer using the heavier of two stable isotopes. D. None of the choices are correct.
Where a given species of vertebrate lives has dramatically shaped the evolution of respiratory adaptations, particularly since the oxygen concentration in air is approximately 20 times that of the oxygen concentration in water. Per unit area of gas exchange surface, which group of vertebrates can extract the greatest total amount of oxygen from the external medium?
A. fish B. mammals C. reptiles D. amphibians E. birds