A plant is treated with a chemical that blocks the flow of electrons between photosystem II and photosystem I, such that protons are not transported from the stroma into the thylakoid compartment. What is the effect of this chemical on photosynthesis?
A. a decreased proton gradient will cause less ATP to be produced from the light reactions.
B. the increased number of protons will be directly used in the thylakoid to produce glucose.
C. an increased proton gradient will provide the energy needed to produce ATP from the light reactions.
D. the increased proton gradient will be used to make NADPH for the Calvin cycle.
Answer: A
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Scientists have studied, in detail, the evolution of the peppered moth, Biston betularia, over the last two hundred years. The peppered moths rest on tree trunks and are a tempting treat for birds in the area. In the mid-1800s the trees in their England habitat were covered with lichens, which are a light, grayish-green color. Although color variations occurred, the vast majority of the moths were light-colored. Because their light coloration effectively camouflaged them against the lichens-covered trees, they were not as easily seen by birds as darker colored moths. The light colored moths flourished.The environment changed, as the Industrial Revolution progressed. By 1900, the lichens had died and trees were coated with soot due to industrial pollution. The lighter colored moths were
no longer "hidden" in their environment, and in fact, were easily seen by their predators. Their numbers dwindled. At the same time, the darker-colored moths flourished because of their ability to hide on the soot-covered trees.a. What type of selection is this?b. What is the agent of selection?c. What alleles were favored in the clean environment? The polluted environment? What will be an ideal response?
The table shows the distribution of the number of bristles in a Drosophila population indicating how many individuals in the population have those particular number of bristles. Calculate the mean number of bristles in the entire population.
a. 4 b. 4.7 c. 13.27 d. 17.14 e. 18.5
Alkapton urea is a familial disease that is autosomal recessive. The defective enzyme in affected individual prevents the metabolism of _____________
A) Procussic acid B) Homogentisic acid C) tyrosine D) alkapton E) phenolalanine