题目

现有某种链状多肽,其化学式是C55H70O19N10 , 消化后只得到下列4种氨基酸: (1) 该多肽是由个氨基酸通过反应而形成的,该多肽合成过程中相对分子质量减少。 (2) 如果该多肽是某种激素,则该激素从合成到分泌到细胞外的整个过程中,直接经过的结构有。 (3) 一分子该多肽被分解后,得到个谷氨酸分子。听下面一段对话,完成第1至2题。1. What do we know about Nora?A. She prefers a room of own.B. She likes to work with other girls.C. She lives near the city center.2. What is good about the flat?A. It has a large sitting room.B. It has good furniture.C. It has a big kitchen.
生物 试题推荐