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【单选题】
1962年初召开的,在三年调整时期具有关键性作用的扩大的中央工作会议被习惯地称为A.
“七千人大会”
B.
西湖会议
C.
南宁会议
D.
广州会议
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【多选题】How do point mutations in regulatory DNA sequences change our ability to digest lactose in milk?
A.
Our earliest ancestors were lactose intolerant, because the enzyme that breaks down lactose—called lactase—was made only during infancy. s, who were no longer exposed to breast milk, did not need the enzyme.
B.
When humans began to get milk from domesticated cattle some 10,000 years ago, variant genes—the product of random mutation—enabled those who carried the variation to continue to express lactase as s, and thus take advantage of nutrition provided by cow’s milk.
C.
We now know that people who retain the ability to digest milk as s contain a point mutation in the regulatory DNA sequence of the lactase gene, allowing it to be efficiently transcribed throughout life. In a sense, these milk-drinking s are “mutants” with respect to their ancestors
D.
It is remarkable how quickly this adaptation spread through the human population, especially in societies that depended heavily on milk for nutrition. These evolutionary changes in the regulatory DNA sequence of the lactase gene occurred relatively recently (10,000 years ago), well after humans became a distinct species.
【简答题】This virus, called 2019-nCoV, is new and we are still learning about it. From what we know now, it can make some people (Q1) ____________________ with a slight (Q2) ________________. Other people get ...
【简答题】水生花卉对生境的需求有哪些特点？
【简答题】Answer the following questions and organize them into a paragraph. Cues are given at the end of each question. Combine the answers, using such words as which , but , since , because , as , and , for ,...
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