2、某三十九肽中共有丙氨酸4个，现去掉其中的丙氨酸得到4条长短不等的多肽（如右图），下列有关该过程的叙述中，错误的是
A．O原子数目不变
B．肽键数目减少7个
C．C原子减少l2个
D．氨基和羧基分别增加3个
1、下列物质或结构中含有糖类的是
①ATP ②DNA ③染色体 ④细胞膜 ⑤脂肪 ⑥淀粉酶
A．①②③④ B．①③④⑥ C．①②③⑥ D．②③④⑥
38、（You may read the questions first）
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1 In advertisement 2, the Traveler enables us to learn__________.
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2 In advertisement 3, the Quizmaster_________.
A. contains nothing but 5400 questions B. can only answer challenging questions
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36、Our English teacher had us all _______our names on a card.
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32、市场上销售的大粒花生和小粒花生是同一种植物两个不同的品种。为探究大、小粒花生种子的大小是否是遗传物质不同造成的，某兴趣小组对大、小粒花生种子进行了如下实验：
（1）将一小块实验地均分成两份，随机抽取种子公司购买的纯合大、小粒花生种子各20粒分别种在上述两块实验地中。
（2）收获期分别收集两块地中的大、小粒花生果实。晒干处理后，随机抽取大、小粒花生种子各30粒,对它们的长度进行测量, 并将数据记录在各自的表格中。
（3）将表格中的数据转换成单坐标双曲线图，如下图所示。
（4）求出大、小粒花生种子的平均长度分别为1.77cm和1.18cm。
根据材料回答下列问题：
（1）该兴趣小组的实验步骤中有两处明显的失误是：
① ；② 。
（2）假设图中的数据是经正确实验步骤操作后获得的，则大粒花生种子平均粒长比小粒花生种子的平均长度要长，说明 ；
大粒花生种子中有比小粒花生种子长度短的，小粒花生种子中也有比大粒花生种子长度长的，说明 。
（3）大、小粒花生种子的大小取决于种子子叶的大小。观察发现大粒花生种皮颜色为浅红色，小粒花生种皮颜色为深红色。为了进一步了解花生种子大小和种皮颜色的显隐性关系，请你简要写出实验设计思路，并就可能出现的实验结果和结论进行讨论。
某三十九肽中共有丙氨酸4个，现去掉其中的丙氨酸得到4条长短不等的多肽（如右图），下列有关该过程的叙述中，错误的是
