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【单选题】
6 番茄种子含水量达到( )即可收购入库。
A.
8%
B.
13%
C.
C14%
D.
16%
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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. Adults, 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 adults, 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 adults 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 adults 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】水生花卉指什么?有哪些类型?
【多选题】水生花卉的共同点有哪些
A.
排水系统发达
B.
通气组织发达
C.
将叶片及时送出水面
D.
机械组织弱化
E.
根系发育不良
F.
花粉传授变异
G.
营养繁殖普遍
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【简答题】水生花卉对生境的需求有哪些特点?
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