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(1)动物细胞的全能性会随着动物细胞____ 程度的提高而逐渐受到限制,目前还不能用类似于植物____ 的方法获得完整的动物个体,因此,通过体细胞克隆的动物,实际是用____ 方法来实现的.

(2)胚胎分割是指采用机械方法将____ 切割成若干等份,经移植获得____ 的技术.来自同一胚胎的后代具有相同的____ ,因此胚胎分割属于____ 或克隆.

(3)胚胎移植技术中供体的主要职能是____ 

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同类题2

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     Becoming Refreshed without sleeping

     Sometimes there is just not enough hours in the day to get everything done and get a good night’s rest.____ Once in a while you can get away with a sleepless night and still feel reasonably good by adjusting your meals and activities.

     ____ The last thing you want to do when you are tired is get warm and cozy, this will cause you to fall asleep. Keeping the air conditioner on will make you feel much more alert and refreshed.

     Eat small amounts. Eating small amounts of healthy food will help refresh you. Fruit and nuts are a good choice because they are nutritious and will energize you ____Try to stick to low carbon meals to keep you going. Chewing gum after your snack or small meal will also help keep you awake.

     Keep it bright. When it is dark your body thinks it is time to go to sleep. Turn on lots of lights, which will trick your body into waking up and feeling better. ____ You get double the benefits if it is daytime.

     Take a break. Taking a little break will help you in the long run. Turn up some energizing music to get yourself positive. Relax and talk to a friend in person or on the phone for a few minutes.____

A. Keep it cool

B. Calm down and sleep

C. Avoid big, heavy meals as they will make you tired

D. Going outside whether it is day or night for some fresh air

E. Missing sleep regularly can make you sick and should be avoided

F. When you are tired, you may just want to sit around and do nothing

G. Having a good time for a few minutes will refresh you quicker than anything else.