NO作为信号分子,它能使细胞内的()分子浓度升高。
A.cAMP
B.cGMP
C.Ca2+
D.DG
E.PKC
参考答案:B
The environmentalist said: “Making money is blameless, but I can't ________ to unnecessary killing of wild animals for that purpose.”
A.subscribe
B.tend
C.oppose
D.suggest
下列物态变化事例中属于放热的是[ ]
A、将水蒸气通入冷凝管中收集蒸馏水
B、冰箱中冷凝剂制冷
C、在衣柜内放“卫生球”防蛀
D、冬天将冻肉放在水中解冻