In eukaryotic cells, which of the following genetic elements can prevent the increase in gene expression that results from the presence of an enhancer sequence?
A) repressor
B) silencer
C) cofactor
D) insulator
E) sigma factor
Answer: D
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A systemic release of histamine and other inflammatory mediators leads to the most dramatic immediate hypersensitivity reaction known as ______.
What will be an ideal response?
____________________ result from immunological hypersensitivity to what should be harmless
substances. Fill in the blank(s) with the appropriate word(s).
Which is an example of Müllerian mimicry?
A. A skunk uses white and black as coloration to warn predators that dealing with them will be unpleasant. B. The unpalatable viceroy butterfly mimics the poisonous monarch butterfly. C. Weeds mimic the form and color of an agricultural plant to avoid being weeded by the farmer.
Why would a diet containing unsaturated fats that form triglycerides be better for an athlete when considering energy levels and health?
A. Unsaturated fats have a linear structure, making them easy to break down and releasing high amounts of energy when glucose levels are low. B. Saturated fats have double bonds, making them harder to break down for energy release and creating artery clogging structures. C. Saturated fats are packed closer together, making their breakdown for energy release less efficient and forming unnecessary fat deposits. D. Unsaturated fats are packed closer together, making them higher in energy storage levels and fluid within the body.