Which of the following would provide the longest lasting treatment for Leber's congenital amaurosis II?
A) Replacing an enzyme that restores the function of T and B cells
B) Substrate reduction therapy and pharmacological chaperone therapy
C) Injecting adeno-associated virus carrying ornithine transcarbamylase (OTC) into T and B cells
D) Injecting adeno-associated virus carrying a wild type version of the RPE65 gene into affected cells of the retina
D) Injecting adeno-associated virus carrying a wild type version of the RPE65 gene into affected cells of the retina
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Why are anionic nutrients generally mobile in soils, and thus easily leached, while cationic nutrients are relatively immobile?
A) Anions readily form crystals while cations do not B) Cations interact with clay particles and organic materials C) Cations have a stronger tendency to aggregate D) Anions are repelled from the surfaces of living roots
Gram-negative bacteria
A. appear purple following the Gram stain. B. include all pathogens. C. are generally more susceptible to antibiotics than gram-positive bacteria. D. have a more complex cell envelope with a greater variation in chemical composition.
Which of these hypotheses cannot be tested by an experiment?
a. Biological interactions between barnacle species are responsible for their distribution patterns. b. Night-feeding fishes rely on their sense of smell to locate prey. c. The growth of salt marsh grass is limited by nitrogen availability. d. Certain humpback whale behaviors are important for attracting a mate. e. Goldfish prefer to eat brightly-colored foods.
How does resistance to drugs spread in bacterial populations?
A. Exposure to drugs causes mutations in bacterial genes. B. Horizontal gene transfer between bacteria spreads R (resistance) plasmids. C. Genetic recombination during sexual reproduction. D. Exposure to drugs induces immunity. E. Exposure to drugs alters gene expression in bacteria.