Crop sunflowers are attacked by many fungal pathogens, such as downy mildew and Sclerotinia, resulting in economic losses of millions of dollars per year. What genes would be best to target for the development of new fungus-killing crop treatments (fungicides)?
A. genes encoding chitin proteins that are shared by downy mildew and Sclerotinia, but absent in sunflower and humans
B. genes encoding metabolite proteins that are shared by downy mildew, Sclerotinia, and humans, but absent in sunflower
C. genes encoding basic development proteins that are shared by downy mildew, Sclerotinia, sunflower, and humans
D. genes encoding growth proteins that are shared by downy mildew, Sclerotinia, and sunflower, but absent in humans
Answer: A
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Using sequence data, it has been shown that:
A. humans evolved from the Neanderthals. B. Homo sapiens arose gradually in many places. C. Homo sapiens arose separately from Homo erectus and Homo neanderthalensis, expanding out of Africa. D. Homo sapiens arose separately from Homo erectus and Homo neanderthalensis, expanding out of Asia. E. Homo sapiens evolved from Homo erectus.
Which of the following lipids is found concentrated in lipid rafts in animal cell plasma membranes?
A) cholesterol B) phosphatidylcholine C) phosphatidylserine D) phophatidylethanolamine E) phosphatidylinositol
Hydroxyl groups are commonly found in:
A) fatty acids. B) DNA. C) carbohydrates. D) amino acids.
The rod photoreceptors in the eye are extremely sensitive to light. The cells sense light through a signal transduction cascade involving light activation of a GPCR that activates a G protein that activates cyclic GMP phosphodiesterase
How would you expect the addition of the following drugs to affect the light-sensing ability of the rod cells? Explain your answers. A. a drug that inhibits cyclic GMP phosphodiesterase B. a drug that is a nonhydrolyzable analog of GTP