Which of the following flaviviruses can be prevented by vaccination?
A) yellow fever
B) dengue fever
C) hantavirus
D) Ebola
Answer: A
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In humans and other mammals, inactivated X chromosomes:
A. exhibit no gene transcription. B. exhibit a low level of transcription of a few genes. C. exhibit a low level of transcription of many genes. D. exhibit a normal level of transcription of a few genes. E. exhibit a normal level of transcription of many genes.
Lipid rafts are
A) regions of the membrane that are high in sphingolipids, which facilitate communication with the external environment of the cell. B) important regions of membrane structure and are comprised of phospholipids. C) regions not typically associated with signal transduction. D) regions where greater concentrations of sphingolipids are on the inner side of the membrane. E) great for white-water rafting.
Isoniazid is a narrow-spectrum antibiotic that ________.
A. is one of the few drugs effective against Mycobacterium tuberculosis B. is not useful as a chemotherapeutic agent C. is one of the few drugs effective against systemic fungal infections D. None of the choices are correct.
For plants, mycorrhizae are______
A) parasitic B) mutualistic C) an adaptation for photosynthesis D) agricultural pests