20种氨基酸光考虑种类能构成多少种蛋白质

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• 已知人类体细胞能合成50 000种不同的蛋白质.平均每种蛋白质由300个氨基酸构成,而合成这些蛋白质仅用了细胞核中DNA碱基对的2%.请计算平均一个核DNA分子至少含有多少个碱基对?
• 20种氨基酸光考虑种类能构成多少种蛋白质
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• A阅读短文,选择正确的答案I live in a town .It’s not big .There is a river three streets in our town .You can see a fruit shop ,a post office ,a bookshop and a school when you walk along the first street .The bookshop is next to the fruit shop .And on its right is the post office .The school is on the right side of the street ,too It’s our school .There is a park in our town .It’s behind the school .We often play games there after class .There’s a farm in the town
• 阅读短文,选择正确答案.The sky usually looks light blue.But if you went to the top of the highest mountain,went to the top of the highest mountain,where there is less air between you and the sun to scatter the sunlight,the sky would be deep,dark blue.And if you rode in a rocket high above the earth,where there is no air at all to scatter the sunlight,the sky would be so dark that it would be black.Sometimes the sky doesn't look blue.At sunrise and sunset,the lig