质膜是半通透性的,一般说分子通过细胞膜的能力主要取决于该物质的()。A、脂溶性 B、水

题型:单项选择题

问题:

质膜是半通透性的,一般说分子通过细胞膜的能力主要取决于该物质的()。

A、脂溶性

B、水溶性

C、带电性

D、扩散性

考点:细胞生物学细胞生物学综合练习细胞生物学综合练习题库
题型:单项选择题

如图所示,一个电量为-Q的点电荷甲,固定在绝缘水平面上的O点.另一个电学量为+q及质量为m的点电荷乙,从A点以初速度v0沿它们的连线向甲运动,运动到B点时的速度为v,且为运动过程中速度最小值。已知点电荷乙与水平面的动摩擦因数为μ,AB间距离为L0,静电力常量为k,则下列说法正确的是(   )

A.点电荷乙从A点运动到B点的过程中,加速度逐渐减小

B.OB间的距离为

C.点电荷乙越过B点向左运动,其电势能仍增多

D.在点电荷甲形成的电场中,AB间电势差

题型:单项选择题

Pasta is the world’s favorite food. Asurveytaken in 17 countriesconfirmedthat pasta is what people like to eat most. Not only is pasta the number one food in its home country -Italy, but is alsoenjoyedin faraway places like the Philippines, Mexico andSouth Africa.

Pasta has become popular, for one thing, because it is cheap and easy to prepare. Just cook noodles or other forms of pasta, make a sauce to go with it and you’re finished. Many different types of meals can becreatedwith pasta. It tastes good and fills your stomach. It produces energy in the form ofcarbohydrates(碳水化合物), which is whyathleteseat pasta regularly. Pasta can also be kept for a longer time. You don’t have to use it up at once.

Pasta has also become popular because it stands for the Italian way of life. People all over the world like it because it’s so simple. It has two basic ingredients(成分), wheatand water, just like bread.

Legend has itthat Marco Polo brought pasta back to Italy with him but this is not true. Arabs probably brought a noodle-likedishtoSicilyin the 8th century. Farmers have been growing wheat, the mainingredientof pasta, there for ages.

The worldwide sales of pasta have risen sharply over the past decade. Italy leads the pasta-eatingcommunityof the world. The Italians are the number one consumers followed by Venezuela and Tunisia.

小题1:In which country do people eat pasta most?

A.Mexico

B.Venezuela

C.The Philippines

D.South Africa小题2:Sports people often have pasta because_________.

A.it costs less money

B.it can be kept longer

C.it provides proper energy

D.it contains no carbohydrates小题3:One reason why pasta is favored is that_______.

A.people like a simple lifestyle

B.it smells just like bread

C.it is rich in nutrition

D.Italian food stands for fansition.小题4:What would be the best title for the text?

A.The origin of pasta

B.Italians’ love for pasta

C.Pasta is changing people’s way of life

D.Pasta—the world’s favorite food

题型:单项选择题

当金融市场中短期流动性不足的情况下,收益率曲线可能会呈现怎样的一种形状()。

A.向右上方倾斜

B.向左上方倾斜

C.水平

D.垂直

题型:单项选择题

下列情形中,应当数罪并罚的有()。

A、判决宣告前,查明甲分别实施了三次受贿行为,数额分别为2万、3万、5万元

B、乙因受贿被判处有期徒刑二年,缓刑三年,在缓刑考验期内,又查明其另外一起受贿2万元的罪行

C、丙因故意伤害罪被判处有期徒刑三年,在服刑期间又犯故意伤害罪

D、丁因盗窃罪被判处有期徒刑二年,执行完毕后,又发现其在该次盗窃以前还有一起重大盗窃犯罪行为

题型:单项选择题

关于2009~2012年全国矿产品贸易和能源生产、消费,能够从材料中推出的是()

A.石油产品年均增速超过一次能源生产量

B.矿产品进出口总额占全国商品进出口总额比重逐年递增

C.矿产品进出口总额最低的年份,一次能源消费同比增量也最低

D.平均每年一次能源生产量超过30亿吨标准煤

更多题库