prophase

简明释义

英[ˈprəʊˌfeɪz]美[ˈproʊˌfeɪz]

n. [遗] 前期

英英释义

单词用法

同义词

反义词

例句

1.Comparison of productive method, energy consumption, product quality and productive cost is emphasized, for optimal technical decision in the prophase project.

着重对烧碱的生产方法、能源消耗、产品质量、生产成本进行比较，为项目前期工作优化技术决策。

2.Seedlings half erect, late prophase drought-resistance, wet resistance.

幼苗半直立，前期抗旱、后期耐湿。

3.By analyzing the rule of life prediction, the improved PERM tend to decrease the thresholds in the prophase of polymer growth, and to increase the thresholds in the anaphase.

通过对人生预测准确性的分析得到启发，在链生长的前期降低复制的门槛，在链生长的后期提高复制的门槛。

4.The research and development of embed modem is composed by three parts:the prophase analyse, the middle design, the anaphase testing.

嵌入式调制解调器的开发，可以分为三大部分：前期分析、中期设计和后期测试。

5.The prophase research in urban comprehensive planning has both scientific research and planning-oriented features.

提出城市总体规划前期研究具有科学研究与规划导向双重特点。

6.The other showed the farina accumulation existing obstacle in the prophase of pollen maturation.

二是花粉成熟前期，淀粉粒积累发生障碍。

7.In prophase 前期, the nuclear envelope begins to break down.

在前期 prophase中，核膜开始解体。

8.The first stage of mitosis is prophase 前期.

有丝分裂的第一阶段是前期 prophase。

9.During cell division, the chromatin condenses into chromosomes in prophase 前期.

在细胞分裂过程中，染色质在前期 prophase中凝缩成染色体。

10.Chromosomes can be observed under a microscope during prophase 前期.

在显微镜下可以观察到染色体，在前期 prophase期间。

11.The spindle fibers start to form during prophase 前期.

纺锤丝在前期 prophase期间开始形成。

作文

In the fascinating world of biology, the process of cell division is a fundamental concept that underpins growth and reproduction in living organisms. One of the key stages of cell division is known as prophase, which plays a crucial role during mitosis and meiosis. Understanding prophase is essential for students and researchers alike, as it sets the stage for the subsequent phases of cell division.During prophase, the chromatin, which is the material that makes up chromosomes, condenses into visible chromosomes. Each chromosome consists of two sister chromatids, which are identical copies of the chromosome connected at a region called the centromere. This condensation is vital because it allows the chromosomes to be easily segregated later in the cell division process. The visibility of chromosomes during prophase is one of the key characteristics that differentiate this stage from others.Another significant event that occurs during prophase is the breakdown of the nuclear envelope. The nuclear envelope is a double membrane that surrounds the nucleus of the cell. As the envelope disintegrates, the contents of the nucleus are released into the cytoplasm, allowing the spindle fibers to interact with the chromosomes. This interaction is crucial for the proper alignment and separation of chromosomes in the later stages of cell division.Additionally, the formation of the mitotic spindle is a hallmark of prophase. The mitotic spindle is composed of microtubules, which are dynamic structures that help in the movement of chromosomes. During prophase, the centrosomes, which are the microtubule organizing centers of the cell, move to opposite poles of the cell. From these centrosomes, the spindle fibers extend and attach to the kinetochores, which are protein structures on the centromeres of the chromosomes. This attachment is crucial for the accurate segregation of chromosomes during cell division.The events of prophase are tightly regulated by various proteins and checkpoints within the cell cycle. These regulatory mechanisms ensure that the cell is ready to proceed to the next phase of division, known as metaphase. If any issues arise during prophase, such as improper chromosome condensation or spindle formation, the cell cycle may be halted to prevent errors that could lead to aneuploidy, a condition where cells have an abnormal number of chromosomes.In summary, prophase is a critical stage in the process of cell division, characterized by chromosome condensation, nuclear envelope breakdown, and spindle formation. A thorough understanding of prophase not only enhances our knowledge of cellular processes but also contributes to advancements in fields such as genetics, cancer research, and developmental biology. As we continue to explore the intricacies of cell division, the significance of prophase will undoubtedly remain a focal point of study, shedding light on the fundamental mechanisms that drive life itself.

在生物学的迷人世界中，细胞分裂的过程是一个基本概念，它支撑着生物体的生长和繁殖。细胞分裂的一个关键阶段被称为前期，它在有丝分裂和减数分裂中发挥着至关重要的作用。理解前期对于学生和研究人员来说都是必不可少的，因为它为细胞分裂的后续阶段奠定了基础。在前期期间，染色质，即构成染色体的物质，凝缩成可见的染色体。每条染色体由两个姐妹染色单体组成，这些单体是染色体的相同副本，通过称为着丝粒的区域连接在一起。这种凝缩是至关重要的，因为它使得染色体在细胞分裂过程中能够被轻松分离。染色体在前期期间的可见性是将该阶段与其他阶段区分开来的关键特征之一。在前期期间发生的另一个重要事件是核膜的破裂。核膜是包围细胞核的双层膜。当核膜解体时，细胞核的内容物释放到细胞质中，使纺锤体微丝能够与染色体相互作用。这种相互作用对于后续细胞分裂阶段中染色体的正确排列和分离至关重要。此外，纺锤体的形成是前期的一个标志。纺锤体由微管组成，这些动态结构帮助移动染色体。在前期期间，中心体，即细胞的微管组织中心，移动到细胞的两极。从这些中心体出发，纺锤体微丝延伸并附着到着丝粒上，着丝粒是位于染色体着丝粒上的蛋白质结构。这种附着对于细胞分裂过程中染色体的准确分离至关重要。前期期间的事件受到细胞周期内各种蛋白质和检查点的严格调控。这些调节机制确保细胞准备好进入细胞分裂的下一个阶段，即中期。如果在前期期间出现任何问题，例如染色体凝缩不当或纺锤体形成异常，细胞周期可能会被暂停，以防止导致染色体数目异常的错误。总之，前期是细胞分裂过程中一个关键的阶段，其特征是染色体凝缩、核膜破裂和纺锤体形成。对前期的透彻理解不仅增强了我们对细胞过程的认识，还促进了遗传学、癌症研究和发育生物学等领域的进步。随着我们继续探索细胞分裂的复杂性，前期的重要性无疑将成为研究的焦点，揭示驱动生命本身的基本机制。