You have been asked to test the effectiveness of drug X in preventing the growth of certain types of cancerous cells. Your responsibilities include designing and executing the experimental approach
After completing the study, you realize that no control variables were defined. How will this impact your drug study?
Failure to define the control variables implies that many unintended factors were left to change with the application of the drug. This would prevent you from determining whether any inhibition of the cancerous cells was due to drug X or some other factor that you did not control. The result is the study would have to be repeated using appropriate controlled variables.
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0.2 mls of a 10-4 dilution of a virus preparation yields 90 plaques. What is the number of PFU per ml in the undiluted virus preparation?
A. 9.0 × 108 B. 4.5 × 106 C. 4.5 × 107 D. 9.0 × 105
The phases of meiosis that most resemble those of mitosis are
A) the meiosis I phases. B) the meiosis II phases. C) meiosis I, except for the pairing of homologues. D) meiosis II, except for the pairing of homolouegs. E) both choices A and B
A gene may have many alleles, but a person has only two alleles for a gene, because
A) having more than two alleles is always lethal. B) a gene can be altered in many ways, but a person has only two copies of any gene. C) a genotype is haploid because of meiosis. D) having more than two alleles unbalances the chromosomes.
Which of the following cancer treatments is LEAST likely to kill healthy cells?
a. chemotherapy b. radiation c. surgery d. All of the above carry the same risks.