Untreated infection of males with Neisseria gonorrhoeae may result in
A) gummas.
B) sterility.
C) trachoma.
D) glomerulonephritis.
E) penile cancer.
B
Bloom's Taxonomy: Comprehension
Section: Bacterial STDs
Learning Outcome: 24.20
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Among the dihybrid crosses below, which will produce offspring with a 1:1:1:1 genotypic ratio?
A) AA BB × aa bb B) Aa Bb × Aa Bb C) Aa Bb × aa bb D) Aa BB × aa BB E) AA bb × aa BB
SCID is defined by a lack of functional B and T cells which eliminates protection by humoral and cell-mediated immunity. Which of the following is true?
A. Genes coding for B and T cell receptors are mutated so the cells are incapable of binding antigens. B. A genetic mutation renders the individual incapable of removing a toxic DNA metabolite from lymphocytes, which ultimately destroys them. C. Genes that code for interleukin receptors are mutated so the individual's B and T cells do not receive the activation signals, rendering them useless. D. A genetic defect disrupts the development of the lymphocytic cell lines. E. All of the above describe cases of SCID.
Consider a mutant organism that is unable to make the amino acid arginine. Knowing that the metabolic pathway for
arginine production is ornithine ® citrulline ® arginine, you test the ability of the mutant to grow in the presence of just one of these compounds. You find that the mutant can grow in the presence of arginine, but not in the presence of citrulline or ornithine. From this, you can conclude that the product of the mutant gene is most directly involved in the production of ____.
a. arginine from ornithine b. arginine from citrulline c. citrulline from ornithine d. ornithine from arginine e. citrulline from arginine
Water can serve as a human reservoir of Vibrio cholerae.
a. true b. false