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已知燃气轮机装置定压加热理想循环的初态参数T 1 =300K，p 1 =0.1MPa，循环中的最高温度T 3 =950K，压缩机的增压比π=p 2 /p 1 =5，所给定的升温比τ=T 3 /T 1 的条件下，试计算该循环的最佳增压比π op ，获得最大循环时的热效率η top 、最大循环的数值以及T 20 和T 40 。
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B.
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A.
Proteins destined for regulated secretion are sorted and packaged in the trans Golgi network. Proteins that travel by this pathway have special surface properties that cause them to aggregate with one another under the ionic conditions (acidic pH and high Ca2+) that prevail in the trans Golgi network.
B.
The aggregated proteins are packaged into secretory vesicles, which pinch off from the network and await a signal instructing them to fuse with the plasma membrane.
C.
Proteins secreted by the constitutive pathway, on the other hand, do not aggregate and are therefore carried automatically to the plasma membrane by the transport vesicles of the constitutive pathway.
D.
Selective aggregation has another function: it allows secretory proteins to be packaged into secretory vesicles at concentrations much higher than the concentration of the unaggregated protein in the Golgi lumen. This increase in concentration can reach 200-fold, enabling secretory cells to release large amounts of the protein promptly when triggered to do so.
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【简答题】“Here, waiter! Look at your soup. What’s this? Is it vegetable soup? No. It’s fly(苍蝇) soup! Look at the bluebottle! Terrible! Pour it onto the face of the cook. Who wants such a wonderful soup?” shout...
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【简答题】be destined to do sth.
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【单选题】be destined to do
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B.
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