4.
According to Snyder et al, all of the following
compounds can bind to specific receptors in the brain EXCEPT
A.
IBMX
B.
Caffeine
C.
Adenosine
D.
Phosphodiesterase
5.
Snyder et al suggest that caffeine’s ability to
bind to A₁ and A ₂ receptors can be at least partially attributed to which of
the following?
A.
The chemical relationship between caffeine and
phosphodiesterase
B.
The structural relationship between caffeine and
adenosine
C.
The structural similarity between caffeine and
neurotransmitters
D.
The ability of caffeine to stimulate behavior
6.
The author quotes Snyder et al, most probably in
order to
A.
Reveal some of the assumptions underlying their
theory
B.
Summarize a major finding of their experiments
C.
Point out that their experiments were limited to
the mice
D.
Indicate that their experiments resulted only in
general correlations
4.
D the
first paragraph explains that both adenosine and caffeine bind to receptors in
the brain. The fourth paragraph attests to the ability of theophyline to bind
to the receptors. The last paragraph describes IBMX as a compound that binds to
adenosine receptors. Thus the exception has to be the enzyme phosphodiesterase.
5.
B The
A₁ and A₂ receptors, so look at the surrounding material. Snyder et al propose
that caffeine, which is structurally similar to adenosine binds to both types
of receptors, just as adenosine does, caffeine’ ability to bind to these receptors
may be due to this structural similarity to adenosine .
6.
B The
third paragraph starts with evidence supporting the new hypothesis on the basis
of experiments with mice. The quotation then begins in general, a phrase that
implies a summary of the results of the work with mice. The quoted material
explains that the more the compounds were able to bind to the receptors the
greater the stimulatory effect. This major finding supports the hypothesis.
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