Final answer:
In a biochemical reaction cascade, when the shuttle bus breaks down, the process continues at half of its original speed due to the reversibility of reactions.
Explanation:
When the shuttle bus breaks down in a biochemical reaction cascade, the process does not stop abruptly; rather, it continues, with half of its original speed. This is because some reactions are reversible, and the reverse reaction will continue at a reduced rate until equilibrium is re-established.
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