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.
D
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Adjacent animal cells utilize ____ to rapidly communicate with each other
a. gap junctions b. plasmodesmata c. hormones d. desmosomes e. neurotransmitters
The ascending and descending nerve tracts
a. are found in the gray matter of the spinal cord. b. are found in the white matter of the spinal cord. c. are covered with myelin sheaths. d. are both sensory and motor. e. all of these except "are found in the gray matter of the spinal cord"
Answer the following questions true (T) or false (F)
1. Chemical reactions involve only the outermost electrons of an atom. 2. Ionic bonds occur through a sharing of electrons. 3. Acids release hydrogen ions into aqueous solutions.
Mutations:
A) account for most of the change in allele frequency in a population. B) may do nothing, may be harmful, or may be beneficial. C) are always detrimental. D) are always beneficial.