【单选题】关于 MHC-I 类分子的功能,下列错误的是
【简答题】My name is Helen. I’m seven. Dale is my brother. He’s eleven. We are in the same school. My mother is a teacher. She teaches English. She is a teacher in our school. My father is a doctor in a big hos...
【简答题】凝胶色谱技术是六十年代初发展起来的一种快速而又简单的分离技术,由于设备简单、操作方便,不需要有机溶剂,对高分子物质有很高的分离效果,目前已经被生物化学、分子生物学、生物工程学、分子免疫学以及医学等有关领域广泛应用,不但应用于科学实验研究,而且已经大规模地用于工业生产。据下图回答问题: (1)a、b均为蛋白质分子,其中先从层析柱中洗脱出来的是_________,原因是__________。 (2)自...
【单选题】— — My name is Helen, and I was born in 1980. My major was electrical engineering.
A.
Tell me your name, please.
B.
Tell me a little bit about yourself, please.
C.
Tell me how old you are, please.
【简答题】My name is Helen Green. My telephone number is 010—98635679. Look! This is my computer. It’s very nice. That is my pencil case. It’s blue and white. My pen is in it. What’s this ? Is it a ring? No, ...
【单选题】My name is Helen, ____am a teacher.
【判断题】克隆载体是指专用于基因或DNA片段无性增殖的基因工程载体。
【简答题】特征X射线产生的机理是什么?具有什么样的特点?
【单选题】关于MHC-I类分子的功能,下列哪项是错误的