High ____ concentrations in Lake Erie encouraged the growth of photosynthetic algae, which changed the
phytoplankton community.
a. sewage
b. detergent
c. coliform bacteria
d. phosphorous
e. dead fish
ANSWER: d
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If you were able to look very closely at a portion of DNA and find methylated histones, you would
A. be mistaken since only DNA can be methylated, not histones. B. be looking at a region of active chromatin. C. be looking at a region of inactive chromatin. D. be looking at a chromatin remodeling complex.
A seed from a yew tree germinates on the forest floor. During the first few months of its life, the sapling dedicates most of its resources to increasing in height rather than producing the defensive compound taxol
What is this allocation of resources an example of? A. a symbiosis B. a trade-off C. a constitutive defense D. an inducible defense E. a basal response
It is thought that viruses may have originated from cells because ____
a. of their small size b. they are pathogens c. they can only replicate within a host cell d. they do not have organelles e. of their genetic material
Which of the following achieves sterilization in the shortest period of time?
A. autoclaving B. boiling C. batch method pasteurization D. an oven at 171°C E. ultra-high-temperature sterilization