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A student with Strep throat (caused by a strain of bacterium) is given a prescription for an antibiotic and is told to take the drug for two weeks. After a week, the student feels better and stops taking the drug. Two months later, the student again shows symptoms of Strep throat and decides to finish the leftover antibiotic rather than going to the doctor again. Two months later, the student develops Strep throat for a third time and returns to the doctor. This time, the antibiotic does not work. The doctor runs a test and discovers that the bacterial strain the student is carrying is antibiotic resistant. What most likely happened?A.Because the use of antibiotics lowers the effectiveness of the immune system, the student continually reinfected himself with the bacteria. The third time, the student happened to be reinfected with a resistant strain. B.When the student stopped taking the drug, a small number of bacteria-those that were more drug resistant-still survived in his body. Those bacteria repopulated his throat and over time, drug-resistant alleles became more common. C.The student must have eaten produce that had been genetically engineered with antibiotic-resistant genes. When he consumed them, the bacteria in the student's throat picked up these genes through horizontal gene transfer. D.The antibiotic caused mutations in the bacterium. The more exposure to the antibiotic, the more mutations. Even one random mutation can confer antibiotic resistance.
What percentage of the father's body was covered by burns? What percentage of the daughter's body received first-degree burns?
A analyzer is studying the inheritance of scale color in a new species of guppy. Base your answer on ALL of the following data.
Determine when a blood vessel bifurcates into two smaller vessels, the radii of the two smaller vessels add up to a larger cumulative radius than the radius of the original vessel.
Suppose you are injecting a subthreshold depolarizing current step into a neuron. Draw the corresponding membrane voltage response;
Using these data, estimate the density (number/hectare) of each size class plus the overall density. [Note: 1 hectare = 10,000 m 2 .]
A patient has been brought to you who is thought to have a mutation of the DVL1 gene, a human homologue of the Drosophila Disheveled gene.
Assume you ask is to work with the genetic code and examine the structure and characteristics of the amino acids used to make proteins and answer the following question.
define What are the ketone bodies?why they accumulate conditions of carbohydrate starvation.
All blood cells in an adult human can trace their ancestry to which compartment within the body?
Explain the probability that the first child of parents who are heterozygous for both traits will show the achondroplasia however not the Huntington's disorder?
Assume you are studying three traits in tropical fish: black and white striped pattern is completely dominant to solid color. For eye color, brown eyes are dominant to hazel eyes.
Which phyla lack organs? What kind of the symmetry do they have? State all of the phyla which show cephalization?
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