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【单选题】
平静呼吸时呼吸运动的特点是A.
吸气和都是主动的
B.
是主动的，吸气是被动的
C.
吸气和都是被动的
D.
吸气是主动的，是被动的
E.
吸气由吸气肌收缩所致，呼气肌收缩所致
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皮皮学刷刷变学霸
举一反三
【简答题】The molecules get closer and closer with the pressure. (增加动词)
【单选题】中国共产党人的初心和使命是______。
A.
为中华民族谋复兴
B.
为中国人民谋幸福
C.
为中国人民谋幸福，为中华民族谋复兴
D.
为中国人民谋发展，为中华民族谋伟大复兴
【单选题】Protein molecules are polymers chains of __________.
A.
amino acid
B.
purines and pyrimidines
C.
sucrose
D.
fatty acid molecules
【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.
【简答题】The molecules get closer and closer with the pressure.
【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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