科幻生物作文450字(科幻小说作文450字左右六年级)

科幻生物作文450字(科幻小说作文450字左右六年级)

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科幻生物作文450字(科幻小说作文450字左右六年级)

科幻生物作文450字【一】

直径为的微小颗粒,主要成分为蛋白质(60%)和RNA(40%。游离存在、附在内质网上,也可形成多聚核糖体。细胞内蛋白质合成的场所。

科幻生物作文450字【二】

Dear Sir or Madam:

In my capacity as the chairman of Biochemistry and Molecular Biology Department, the School of Life Science, Nankai University, I deem it a pleasure to recommend Mr. Bruce Liu as a worthy candidate for graduate studies at the Department of Cell and Molecular Biology of your esteemed university.

Over the past four years, I delivered two important courses Genetics and Cell Engineering to the Mr. Liu‘s class and his performance was impressive. He is endowed with a strong curiosity in the quest for new knowledge. Before attending each class, he would make full preparations so that he could quickly assimilate what was being taught. Sometimes he could come up with some surprisingly thought-provocative questions and he had a habit of discussing important problems with me in great detail. During those discussions, he often brought with him valuable materials that he obtained from a large quantity of technical literature. Such an initiative enabled him to broaden his ken of knowledge extensively and to cultivate and significantly improve his ability in reading technical literature in English and to follow the latest scientific and technological development in the world. Therefore, even before he graduated, he had already distinguished himself from the rest of his classmates in his English proficiency. Furthermore, his indefatigable spirit of reading large amount of technical materials was not simply intended to secure high scores in his coursework, but more importantly, to satisfy his almost insatiable interest in biology.

Apart from this, I was also very impressed by Mr. Liu‘s hands-on ability in conducting experiments. For many complicated experiments, he undertook them with a rigorous and conscientious attitude and would always complete them satisfactorily. In dealing with crucial steps involved in the experiments, he tended to make bold hypotheses and conduct substantial observations, ultimately achieving remarkable results. All those testify to Mr. Liu‘s tremendous potential in academic research, especially in his analytical skills and in the execution of experimental procedures.

In addition to his scholastic aptitudes, Mr. Liu can be described as trustworthy in personality. His kind-hearted nature and his integrity have created many friends for him. By no means a bookworm, Mr. Liu took an active part in extracurricular activities in which he enhanced his group spirit and the sense of collectivism. His willingness to assist his classmates has brought him a very high reputation.

To summarize, Mr. Liu has been an outstanding student in our department and he is fully qualified to undertake high-level studies in a more challenging environment. His excellent qualities will undoubtedly facilitate him in achieving satisfactory results in his future academic pursuit and in his career.

Yours Sincerely

Professor and Chairman of Biochemistry and Molecular Biology Department

Nankai University

科幻生物作文450字【三】

1、细胞壁的形成:由原生质体分泌的物质形成,在细胞分裂过程中已形成。成分:主要是纤维素、果胶质,还有非纤维素的多糖、水和蛋白质等其他物质。

2、细胞壁的功能:维持细胞形状,保护原生质体,影响植物的吸收、保护、支持、蒸腾、物质运输、分泌等要的生理活动。

3、细胞壁的结构:

科幻生物作文450字【四】

为单层膜围成的小泡,是分解蛋白质、核酸、多糖的细胞器。内含多种水解酶,可分解从外面进入到细胞内的物质,也可消化局部细胞器或整个细胞。

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