All aminoglycoside antibiotics function by
A. blocking DNA transcription.
B. blocking absorption at the cell membrane.
C. interfering with cell wall synthesis.
D. attaching irreversibly to bacterial ribosomes.
E. preventing normal metabolic functions.
Answer: D. attaching irreversibly to bacterial ribosomes.
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Transposable elements are considered to be "selfish" genes because they _____
A) have multiple promoters B) require multiple RNA polymerases for transcription C) reproduce without increasing the fitness of the host D) do not produce mRNA
Contrast Mendel's model of heredity with the blending model. Which one is a better description of the way traits are passed from one generation to the next?
What will be an ideal response?
The respiratory system exchanges which gases?
A. Carbon dioxide is inhaled, while oxygen is exhaled. B. Both oxygen and carbon dioxide are inhaled, and only carbon dioxide is exhaled. C. Oxygen is inhaled and exhaled, the gas exchange does not include carbon dioxide. D. Oxygen is inhaled, while carbon dioxide is exhaled.
The spinning glands of insects that make threads and silk develop from:a
epithelial cells. b. goblet cells. c. osteoblasts. d. osteoclasts. e. sebum.