A patient has a reactive RPR result and a positive FTA-ABS test. The drug of choice to treat this infection is:
a. penicillin G.
b. tetracycline.
c. clindamycin.
d. erythromycin.
A
For all treponemal infections, penicillin G is the drug of choice. Ceftriaxone is also highly active in most cases of syphilis other than early syphilis. Tetracycline or doxycycline is often the treat-ment of choice when patients are allergic to penicillin. Treatment varies, depending on the stage of disease and the host (e.g., children or adults, human immunodeficiency virus [HIV]–infected or congenital syphilis).
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You have two populations of flowering plants. In these populations floral color is controlled by one gene. The red gene (R) is dominant to the white gene (r). In population one, 75% of the flowers are red, in population two 25% of the flowers are white
Assuming H-W, which population has a greater frequency of the R allele? A. population 1 B. population 2 C. Neither; they both have the same frequency.
Which of the following statements is false?
a. Chromosomes do not pair during mitosis. b. Genes and chromosomes are duplicated during prophase. c. Each species has a specific number of chromosomes. d. New nuclei are formed during telophase. e. A diploid cell will produce two diploid daughter cells by mitosis.
Fire results in the production of ash from vegetation and soil organic matter. This ash contains nutrients that are most often
A) lost from ecosystems almost immediately following the fire. B) devoid of elements required for plant growth. C) unavailable for mineralization causing nutrient retention in the system. D) available for plant uptake and vulnerable to loss if not taken up by recovering vegetation.
You have identified a protein that you hypothesize is a sigma factor in E. coli that has not yet been characterized. You have purified the protein. What types of experiments could you perform to investigate whether or not the protein is a sigma factor?
What will be an ideal response?