乙酰CoA需从线粒体内进入胞液,用于合成脂肪酸,下列哪种物质不可以用来转运()。A.

题型:单项选择题

问题:

乙酰CoA需从线粒体内进入胞液,用于合成脂肪酸,下列哪种物质不可以用来转运()。

A.α-酮戊二酸

B.乙酰乙酸

C.肉毒碱

D.柠檬酸

考点:化学工程生物化学生物化学题库
题型:单项选择题
设二次函数f(x)=(k-4)x2+kx
(k∈R)
,对任意实数x,有f(x)≤6x+2恒成立;数列{an}满足an+1=f(an).
(1)求函数f(x)的解析式和值域;
(2)证明:当an∈(0,
1
2
)
时,数列{an}在该区间上是递增数列;
(3)已知a1=
1
3
,是否存在非零整数λ,使得对任意n∈N*,都有log3(
1
1
2
-a1
)+log3(
1
1
2
-a2
)+…+log3(
1
1
2
-an
)>-
1+(-1)n-12λ+nlog32恒成立,若存在,求之;若不存在,说明理由.
题型:单项选择题

火成岩、沉积岩经变质后形成变质岩,前者形成的变质岩称为();后者形成的变质岩称为()。

题型:单项选择题

England is not a big country: from north to south and from east to west it is only about three hundred miles across. (76) But for a small country it has a surprising range of climate. People who have never visited England, or who have visited only one part of it, often make the mistake of thinking that it is a cold and wet country. Except for the summer months of June to September, this is probably true of the north of England and the Midlands. In the south, however, the climate is much more pleasant. One result is that when people retire from a job in the north they often prefer to move down to the milder south.
Perhaps the warmest part of the country is the southwest, which consists of the counties of Devon and Cornwall. The warm Gulf Stream flows across the North Atlantic Ocean from the Gulf of Mexico and makes the coastal regions of the southwest quite warm. Palm trees, bamboo (竹) and many semi-tropical (亚热带的) plants grow well in the southwest of England. Flowers and vegetables ripen(成熟) as much as a month earlier than those elsewhere. Farmers in the area obtain a higher price for their vegetables and flowers because they are ready earlier. (77) In winter there may be several feet of snow in other parts of England but there will probably be no snow at all in the southwest. This may be one of the reasons why the southwest is one of England’ s most popular holiday areas.

England is a country ______.

A.with a cold and wet climate

B.with a surprising climate

C.with a pleasant climate

D.with a variety of climates

题型:单项选择题

读下图“水循环示意图”,完成下列小题。

在水循环的各个环节中,南水北调工程体现人类活动对下列的哪个环节施加影响()

A.②

B.③

C.④

D.⑤

题型:单项选择题

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