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BSC2011L
Module 1- barcoding, PCR, Electrophoresis, Hardy-weinberg
Question | Answer |
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Which of the following best describes the mechanism of action of the antibiotic streptomycin? | It disrupts protein synthesis in nonresistant bacteria. |
Let's say you inoculate four agar plates, each containing a different antibiotic (A, B, C, and D), and you add a swab from a lesion taken from a patient. After incubating the plates, you observe that plate A has only a few colonies, while the others all h | Bacteria in the patient's sample are susceptible to antibiotic A but not B, C, and D |
How does an antibiotic act as a selective agent in promoting bacterial resistance? | Bacteria with a random mutation that allows resistance to that antibiotic are able to survive exposure and reproduce, passing the resistance mutation on to subsequent generations of bacteria. |
Two agar plates, one containing the antibiotic streptomycin and one without antibiotics, are inoculated with E. coli. After incubation, the streptomycin negative plate has many bacterial colonies, while the streptomycin positive plate has only a few colon | the antibiotic streptomycin |
the antibiotic streptomycin | natural selection |
Natural selection occurs when | a new genetic variation occurs that allows individuals to have a reproductive and survival advantage. |
In a population, 25% of individuals exhibit albinism which is a lack of production of the pigment melanin. It is caused by two recessive allele (q2). What is the frequency of the recessive allele (g) in this population? | 0.50 |
Which of the following is the source of new, novel alleles in a population? | mutation |
What does it mean for a population to be in Hardy-Weinberg equilibrium? | There are no changes in gene frequencies from one generation to the next. |
In a sample population of people, 36% have the recessive trait of "free" earlobes (q2). What is the frequency of the dominant allele for attached earlobes, p? | 0.40 |
Even though a population in true Hardy-Weinberg equilibrium cannot exist, how can using the equation be useful? | It can be used to detect changes in gene frequencies in a population over time. |
Which of the following apply to the development of streptomycin resistance in E. coli? | The E. coli population has genetic variation. The selective agent is streptomycin. The mutation resulting in streptomycin resistance is random. |