The unfolding of a protein by heat or chemical treatment is referred to as:
A. disaggregation.
B. uncoupling.
C. denaturation.
D. hydrolysis.
E. depolymerization.
Answer: C
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Why do researchers think the first self-replicating molecule was RNA?
A) RNA is the only type of molecule that can catalyze a chemical reaction. B) RNA can carry information and catalyze chemical reactions. C) Self-replicating molecules of RNA exist today, in human cells. D) Fossil evidence of such a molecule was recently discovered.
Gene silencing ____
a. cannot be inherited b. occurs when DNA is methylated c. occurs due to histone acetylation d. is an example of posttranscriptional regulation e. occurs only on the X chromosome
In interference competition, two or more populations use the same limiting resource
Indicate whether the statement is true or false.
Beaked whales feed at various depths, but they defecate at the ocean's surface. Nitrogen-rich whale feces deposited in surface waters supply nutrients for algae that are eaten by surface-dwelling fish. Which of the following best predicts what would happen if the whale population decreased?
A) There would be a reduction in surface nitrogen concentration, which would cause an algal bloom B) The surface fish populations would decline due to reduced populations of algae C) The remaining whales would accumulate mutations at a faster rate D) The remaining whales would be forced to forage in the deepest parts of the ocean