Sometimes after you have been exercising very hard your muscles ache due to the build up of lactic acid. Lactid acid has build up in your muscles because
A. Glucose is being broken down in the absence of oxygen
B. Your muscles are burning fat for energy
C. Glucose is being broken down in the presence of oxygen
D. Your heart is pumping very fast and delivering more oxygen to your muscles than they can handle
Answer is A. Glucose is being broken down in the absence of oxygen
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The diversity of our native grassland species is in decline. Restoration ecologists working to restore native grasslands are experimenting with combinations of burning and grazing to simulate natural conditions and increase species diversity
According to Joseph Connell, what level of burning and grazing should ecologists aim for? A. Strong enough to limit interspecific competition, but not strong enough to limit the number of species that can tolerate the environment. B. Strong enough to promote interspecific competition and niche diversification, but not strong enough to promote competitive exclusion. C. Strong enough to promote indirect competition, but not strong enough to promote direct competition. D. Strong enough to selectively favor one or more keystone species, but not strong enough to favor their competitors. E. None of these.
Which protein is responsible for the initial step in unwinding the DNA helix during replication of the bacterial chromosome?
What will be an ideal response?
Two bird species overlap in a hybrid zone. They are isolated by a slight difference in the male songs and by the females' tendency to select males with the "correct" song. Hybrid offspring tend to have reduced fertility compared to either of the parent
species. What effect might natural selection have in this situation? A) Natural selection might favor males with less distinctive calls and/or females that are less "choosy." B) Natural selection might favor males with more distinctive calls and/or females that are more "choosy." As a result, the reproductive barrier between the two species could be reinforced. C) Natural selection could lead to the hybrid species taking over and eliminating the weaker parent species. D) Natural selection could lead to the stronger of the two species taking over and eliminating the other species.
________ dating uses ratios of potassium to argon and can be used to determine absolute age
Fill in the blank(s) with correct word