Gene flow means most nearly the same as
a) genetic drift
b) natural selection
c) migration
d) founder effect
e) meiotic drive
Answer: c) migration
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____ food chains tend to predominate in aquatic ecosystems
a. Higher trophic level b. Primary consumer c. Decomposing d. Grazing e. Detrital
Which area of the brain will integrate taste and smell signals with emotional states and stored
memories? a. the thalamus b. the hypothalamus c. the limbic system d. the pineal gland e. the corpus callosum
A current problem in modern medicine is the development of drug resistance mutations. This occurs when a mutation arises in a disease-causing microbe making it resistant to a drug and thus rendering the drug useless in treating a specific disease. Many useful drugs are competitive inhibitors of specific enzymes, and the drug-resistance mutations prevent the binding of the drug. These types of mutations, in addition to preventing competitive inhibitor binding, can also sometimes reduce the activity of the enzyme. Why is that the case?
A. These mutations most likely affect an allosteric site on the enzyme B. These mutations lower the activation energy of the reaction catalyzed by the enzyme C. These mutations most likely change the shape of the active site of the enzyme D. Binding to the competitive inhibitor is essential for the function of the enzyme
The primary but not only process responsible for the modifications that occur in organisms over geological time is:
a. genetic mutation. b. natural selection. c. morphological (phenotypic) modification. d. increase in fitness.