论一节生物课作文400字【一】
根据质体的色素分为：白色体、有色体和叶绿体。白色体根据储存的物质不同又分为造粉质体，蛋白质体，油体。
论一节生物课作文400字【二】
形成：细胞体积生长阶段时产生。
特点：由纤维素，少量半纤维素及果胶质组成，薄、柔软。
功能：具弹性和可塑性，并可透水分和溶质。
论一节生物课作文400字【三】
横切面为平行双层膜结构，两层膜之间有空腔。分为光面内质网、糙面内质网。
论一节生物课作文400字【四】
“什么是生物？人从哪里来？细胞是什么？又是怎样的？”一连串问题经常浮现在我的脑海里。从小我就对这些问题十分感兴趣，总爱向大人们问这问那，可他们的回答总是：“长大后你就知道了！”
上了初中后，我开始学习生物。渐渐的，我开始明白许多道理，也弄清了我那些奇思妙想的问题的答案。我迷上了这门学科，或许是因为觉得新鲜吧，也可能是对此有极大的兴趣吧，对我来说，最喜欢的就是到生物实验室去做实验。但是，仅仅是课堂上的实验并不能满足我的***，于是，我进了生物兴趣班。
在那个宽敞明亮的生物实验室里，我认识了许多新“朋友”：碘液、烧杯、试管、显微镜……接着，在他们的帮助下，我解决了许多问题。我终于看到了显微镜下的细胞，我终于看到了世间不少稀奇的东西。
原来在这美丽的世界里，还存在着许多肉眼所看不见的东西。在这里，我懂得了与同学合作的重要性；在这里，我体会到动手动脑的乐趣；在这里，我探索属于我们的小小世界；在这里，我明白了也体会到了那种打开智慧之门的乐趣。或许对于我来说，做实验是一种不可多得的乐事。
有人说：“参加兴趣班可是会浪费时间，影响学习的！”我却不那么认为，因为对我来说，甚至是对所有的生物班同学来说，这完全是学习的一种放松，可又不能这么说，因为我们也是在学习，也就是：我们在玩中学，学中玩。
其实有时候，我也为参加兴趣班而感到自豪。记得有一次，我们在科代表的带领下来到生物实验室，这节课是用显微镜观察细胞，对别的同学来说是十分生疏的，但对几个上兴趣班的同学来说，都是“老朋友”了。因为熟悉，我早早做完实验，在那里看课本，可是我发现周围的同学都在那里皱眉头，于是，我主动上前去帮助他们做实验。听着同学们的赞叹，看着他们钦佩的眼光，我感到很自豪。
总而言之，是生物课给我带来乐趣；是生物课让我学会团结；是生物课让我满足；也更是生物课，带我进入另一个神奇而美妙的世界！
论一节生物课作文400字【五】
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
