The polymerase chain reaction (PCR) can be used to produce ________ of copies in a few hours.
A. billions
B. hundreds
C. millions
D. thousands
Answer: A
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The building blocks of nucleic acids are
a. amino acids. b. nucleotides. c. pentose sugars. d. phosphate groups. e. nitrogenous bases.
Chlorofluorocarbons (CFCs) are pollutants because ____
a. they do not break down easily b. they combine with water to form hydrochloric and hydrofluoric acids c. they are found in smog d. they are photochemical oxidants e. they combine with carbon dioxide to form acid rain
When a population undergoes strong selection, what is most likely to happen to it?
A) The most common type of organism is replaced with a different type. B) Variation increases in the population. C) New mutations will form more frequently. D) The number of individuals in the population will rapidly increase.
Figure 43.6
The above figure of goslings (baby geese) following their mother demonstrates ____.
A. imprinting behavior B. operant conditioning C. systematic desensitization D. reactionary behavior E. voluntary behavior