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【单选题】
为了既能与国际标准UCS(Unicode)接轨,又能保护现有中文信息资源,我国政府发布了( )汉字编码国家标准,它与以前的汉字编码标准保持向下兼容,并扩充了UCS/Unicode中的其他字符。A.
GB2312
B.
ASCII
C.
GB18030
D.
GBK
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【简答题】细胞表面黏着因子(cell adl]esion molecules，CAMS)
【单选题】Gernerally,animals cannot digest the glycosidic linkages between the glucose molecules in cellulose.How then do cows get enough nutrients from eating grass?
A.
Microorganisms in their digestive tracts hydrolyze the cellulose to individual glucose units.
B.
The flat teeth and strong stomach of herbivores break the cellulose fibers so that the cows get enough nutrition from the cell contents.
C.
Cows and other herbivores are exceptions and make some cellulose-digesting enzymes.
D.
They have to eat a lot of it.
【单选题】One of the basic ways substances can get in and out of cells is by simple diffusion . Diffusion is the movement of molecules __________.
A.
from an area of low pressure to an area of high pressure
B.
from an area of high pressure to an area of low pressure
C.
from an area of greater concentration to an area of lesser concentration
D.
from an area of lesser concentration to an area of greater concentration
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