问题
名词解释
纤维和纤维素
答案
参考答案:
纤维:为细长、两端稍尖并有较厚的次生壁的细胞,具木素或不具木素,成熟的纤维,其内容物质消失,成为死细胞,为植物体中的机械组织;纤维素:为线性的多糖,其实验式(C6H10O5)n,是由β-D-葡萄糖分子缩聚所构成的一个数目很多的葡萄糖酐单位,是组成细胞壁的主要化学成分。
纤维和纤维素
参考答案:
纤维:为细长、两端稍尖并有较厚的次生壁的细胞,具木素或不具木素,成熟的纤维,其内容物质消失,成为死细胞,为植物体中的机械组织;纤维素:为线性的多糖,其实验式(C6H10O5)n,是由β-D-葡萄糖分子缩聚所构成的一个数目很多的葡萄糖酐单位,是组成细胞壁的主要化学成分。
用方框中所给单词的适当形式填空。 | ||
2. You can buy some bread and cakes in the _ . 3. Look! Some children are playing with _ disk. 4. The soup is too _. I can't stand it. 5. The waste paper were __ everywhere. How dirty!
7. Don't take too many things except _____. water while hiking. 8. I met a few old friends there and we really had a _____evening. 9. He decided _____ the new dish by himself. 10. The book has _____from the table to the floor several times. |