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【多选题】
Explain how some intracellular signaling proteins act as molecular switches.A.
Many intracellular signaling proteins behave as molecular switches: receipt of a signal causes them to toggle from an inactive to an active state.
B.
Once activated, these proteins can stimulate—or in some cases suppress—other proteins in the signaling pathway. They then persist in an active state until some other process switches them off again.
C.
If a signaling pathway is to recover after transmitting a signal and make itself ready to transmit another, every activated protein in the pathway must be reset to its original, unstimulated state.
D.
Thus, for every activation step along the pathway, there exists an inactivation mechanism. The two are equally important for a signaling pathway to be useful.
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【单选题】Great changes ahve taken place since then in the factory we are working.
A.
where
B.
that
C.
which
D.
there
【单选题】Because of the recent fire in the factory, all the stocks were destroyed. (), we cannot make shipment as arranged before.
A.
In the case
B.
In this cases
C.
In this event
D.
At this event
【单选题】The river by waste products from the factory. We can find no fish in it.
A.
has polluted
B.
will pollute
C.
has been polluted
D.
will be polluted
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