What is/are true of the polymerase chain reaction?
a. PCR allows for the mass production of a specific DNA sequence without cloning.
b. PCR permits scientists to target a single copy of a single gene among millions of other
sequences.
c. PCR allows scientists to study DNA from samples of finite amounts, such as from fossils,
or small tissue samples left at a crime scene.
d. PCR cannot be used to clone DNA of unknown sequence
e. all of these
E
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Sensitization is a type of memory where increased responsiveness to mild stimuli occurs after
experiencing a strong stimulus.
Indicate whether the statement is true or false.Activities associated with the parasympathetic division of the autonomic nervous system include
A. "fight-or-flight" response. B. increased heart rate. C. release of epinephrine only. D. release of both acetylcholine and epinephrine. E. resting and digesting.
In amphibians, what function does the cloaca
serve?
a. urination b. defecation c. reproduction d. locomotion e. all of these except locomotion
When plants of a particular species are growing too close to each other, crowding may eventually lead to mortality, known as self-thinning. This type of mortality is:
a. density dependent. b. density independent. c. exponential.