[語文] GWD25-Q36
題目
The chemical adenosine is released by brain cells when those cells are
active. Adenosine then binds to more and more sites on cells in certain areas
of the brain, as the total amount released gradually increases during
wakefulness. During sleep, the number of sites to which adenosine is bound
decreases. Some researchers have hypothesized that it is the cumulative
binding of adenosine to a large number of sites that causes the onset of
sleep.
Which of the following, if true, provides the most support for the researchers
' hypothesis?
A. Even after long periods of sleep when adenosine is at its lowest
concentration in the brain, the number of brain cells bound with adenosine
remains very large.
B. Caffeine, which has the effect of making people remain wakeful, is
known
to interfere with the binding of adenosine to sites on brain cells.
C. Besides binding to sites in the brain, adenosine is known to be
involved
in biochemical reactions throughout the body.
D. Some areas of the brain that are relatively inactive nonetheless
release
some adenosine.
E. Stress resulting from a dangerous situation can preserve wakefulness
even
when brain levels of bound adenosine are high.
題目假設酵素的累積和睡眠有關係
我不懂為什麼是B 不知道有沒有人可以解釋看看呢
謝謝
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 61.59.224.155
GMAT 近期熱門文章
PTT職涯區 即時熱門文章