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【简答题】
琼脂是以()为主要成分的一种高分子多糖类，这一点类似淀粉;但淀粉可被酶分解成单糖，可作为有机体的能源，而琼脂食用时不被酶分解，所以几乎没有营养价值。
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举一反三
【单选题】__________ is a series of catabolic steps in which complex food molecules are broken down to their chemical building blocks by enzymes.
A.
Chemical digestion
B.
Physical digestion
C.
Ingestion
【单选题】Food is broken down both physically and chemically in the process called____.
A.
absorption
B.
digestion
C.
ingestion
D.
mastication
【判断题】Absorption is the process by which food is broken down into small molecules.
A.
正确
B.
错误
【简答题】Before being absorbed, food is broken down by our digestive system into ________________.
【单选题】__________ is a series of catabolic steps in which complex food molecules are broken down to their chemical building blocks by enzymes.
A.
Chemical digestion
B.
Mechanical digestion
C.
Physical digestion
D.
Ingestion
【简答题】Fill in each blank with the most appropriate word or phrase from the ones listed on Student's Book. Many animals eat plants,(1)________ not many plants use animals as food.(2)________,some plants are ...
【简答题】The digestive process begins in . Food is partly broken down by the process of chewing and by the chemical action of salivary enzymes (these enzymes are produced by the and break down starches into sm...
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