时间效用

空间效用

形态效用

以上全是

The cell-cycle control system can transiently delay progress through the cycle at various transition points to ensure that the major events of the cycle occur only when the cell is fully prepared.

At these transitions, the control system monitors the cell’s internal state and the conditions in its environment, before allowing the cell to continue through the cycle. For example, it allows entry into S phase only if environmental conditions are appropriate; it triggers mitosis only after the DNA has been completely replicated; and it initiates chromosome segregation only after the duplicated chromosomes are correctly aligned on the mitotic spindle.

To accomplish these feats, the control system uses a combination of the mechanisms we have described. At the G 1 -to-S transition, it uses Cdk inhibitors to keep cells from entering S phase and replicating their DNA .

At the G 2 -to-M transition, it suppresses the activation of M-Cdk by inhibiting the phosphatase required to activate the Cdk. And it can delay the exit from mitosis by inhibiting the activation of APC/C, thus preventing the degradation of M cyclin.

看对方反驳是否犀利

看辩手的配合

不在乎辩风

失误是否突出

经常积水地点

山坡

建筑入口处

街道绿地

the time that it takes for a check to clear

the time that it takes from when a customer places an order until the selling firm receives the order

also called the replenishment cycle

also called the vendor cycle

正确

错误

生产性

消费性

实用性

投资性.

正确

错误