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【简答题】The Power of Positive Thinking Human emotion is one of those factors that cannot he definedexactly. The reason is that it is quite uncertain. We cannot change thefeelings that are roused when we exper...
【简答题】下列对诗歌的鉴赏,不恰当的一项是( D )A. 诗人把自己对母校的深情融进了悄然别离时那富于特色的形象和想象中。 B. 徐志摩年轻时曾在康桥读书生活过,对康桥怀有一种特殊的感情。 C. 诗歌中水草、柔波、彩虹、星辉等意象,恰当地衬托了诗人静默、悠然的心境。 D. 诗人运用比喻、拟人、借代等修辞手法,写出了康桥那特有的优美景色。 一语未完,只听后院中有笑语声,说:“我来迟了,没得迎接远客!”黛玉思忖...
【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？
【简答题】绝妙的艺术珍品——鸟卵 我们都见过鸡蛋和鸭蛋。鸡蛋的色泽有黄红色的，也有白色的，而鸭蛋却是青白色的，它们是最普通的鸟卵。世界上近九千种鸟类，它们的卵大小不一，颜色各异，形状不同，千变万化。绿的形如翡翠，蓝的恰似宝石，白的好象玉石，红的如同玛瑙。卵壳表面的斑驳点块，就跟镶嵌在上面的五颜六色的珍珠一样，闪闪发光，耀眼夺目。它是大自然赐给人类的绝妙的艺术珍品。 鸿雁的卵壳黄中透红；白鹭的卵壳为翠绿色，短...
【简答题】CA614车床中属于点动控制的电动机是 。
【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？
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