Biotechnology can be defined as the:
A) production of new mammals through cell reprogramming.
B) use of technology to identify criminals.
C) use of technology to control biological processes as a means of meeting societal needs.
D) ability to reprogram cells by splicing DNA from one species into another.
Answer: C
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Is it as effective to take two antibiotics sequentially for an infection as it is to take them simultaneously, so long as the total length of time of the treatment is the same?
A. No. There's always one specific antibiotic that will be the most effective, and that is the only antibiotic that should be used to treat a particular infection. B. Yes. So long as the length of time is the same, the two treatments should be essentially the same in terms of effectively eliminating the infection. C. No. Taken sequentially, the first antibiotic will select for the small portion of the population that will spontaneously mutate towards resistance. Then, the second antibiotic will do the exact same thing-selecting for resistance to the second drug from the few bacterial cells that remained from the first drug treatment. D. It depends. Provided that the majority of the infectious agent is killed off by the first drug, the likelihood that the few that are left would not also be killed by the second drug is low. However, simultaneous treatment should be more effective at eliminating all the microbes in the shortest time possible, and with the least probability of selection for multiple drug resistance mutations.
Which of the following is the effect of atrazine
on cells?
a. they induce the conversion of testosterone to estrogen b. they block the production of cortisol c. they enhance the production of melatonin d. they cause the conversion of insulin into glucagon e. they prevent TSH from stimulating thyroid hormone production
The sodium-potassium pump transports two Na+ out of the cell for every two K+ transported in
____________________ Indicate whether the statement is true or false.
Classical" nuclear localization signals are composed primarily of
a. hydrophobic amino acids. b. acidic amino acids. c. basic amino acids. d. sulfur-containing amino acids.