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4. A company has designed a new weight loss drug. They want to determine if the drug is carcinogenic, so they use it in the Ames test. Bacteria used in the Ames test are His-auxotrophs, and all of the bacteria are plated on minimal media without histidine. The results are
- Test substance + rat liver + distilled water= 500- Test substance + distilled water=4- Distilled water=8- Rat liver enzymes=1- Positive control that has a known mutagen=675
The test substance is:A) mutagenB) a mutegen, but only when metabolizedC) not a mutagenD) can't tell - there is contamination in the experiment
5. Which of the following would you use to find a telomeric sequence?A) genomic DNA libraryB) cDNA libraryC) mRNA libraryD) Answers B and CE) All of the above
6. What is genomic DNA libraryA) A collection of vectors, each containing a fragment of the original genomeB) A complete sequence of the genetic material in an organismC) An electronic file that may be used for additional genetic analysisD) A collection of mRNA from a given cellE) None of the answers are correct
Dominant-recessive relationships can make determining genotype tricky, since an individual with the dominant phenotype may have either the homozygous dominant genotype or the heterozygous phenotype.
Recalling a significantly emotional past event or feeling can elicit the same physiological response as the original event.
Why are mutation and recombination important in the process of natural selection and the evolution of organisms?
A class of environmental science students decided to determine the composition of trees in a forest next to their campus. The students decided to conduct a point-quarter survey.
Determine which mode of inheritance produces heterozygotes with phenotypes that differ from homozygote but more closely resembles one homozygous phenotype than other?
Suppose that some sort of natural disaster eliminated all individuals with recessive phenotype. After remaining individuals recovered and repopulated their habitat,
Determine how to calculate osmolality for an electrolyte versus nonelectrolytes and molality versus osmolality.
Discuss how can growth characteristics on a streak plate, broth culture or slant culture be used in the identification of a bacterial species or strain?
The antibiotic anisomycin is expected to not inhibit the growth of bacteria and to inhibit the growth of Halobium. Anisomycin is resistant to bacteria,
A solution containing 80% cytosine and 20% uracil was used to create synthetic RNAs. A bacterial cell free system produced proteins using these mRNAs in the following proportions.
What defence was successful in preventing you from grab the snake. While travelling in Texas, you stumble across a snake with red, yellow, and black bands.
Discuss how does the concept of natural selection explain variations in species descended from a common ancestor?
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