[問題]GWD 25-Q36

[bonus]

Q36:
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.

Answer: B

[bonus]

題目說大腦的細胞分泌一種A當這些細胞活躍的時候，
當人醒著的時候，分泌的A越來越多，A就bind to越來越多大腦裡的sites。
在睡覺期間，A bind to的sites越來越少，研究者們就認為是由於A bind to到大量的sites導致了睡覺。問支持？

選項B
咖啡因能讓人保持清醒，妨礙了A bind to細胞上的sites的，妨礙了A去bind to sites，也就妨礙了睡眠，支持了結論A bind to 細胞上的sites到一定數量導致了睡眠。

[spiritostar]

這個題目似乎跟OG11裡面的某篇RC有莫名的相關...............
紫本第44頁那篇

[dibert8]

以邏輯公式推推看:
cumulative binding => onset of sleep
~(onset of sleep) => ~(cumulative binding)
remain wakeful => ~(cumulative binding)
就是 (B) 講的