cell wall

简明释义

格式壁

英英释义

例句

1.The cell wall of fungi is composed of chitin.

真菌的细胞壁由几丁质组成。

2.The structure of a plant cell is supported by its cell wall.

植物细胞的结构由其细胞壁支撑。

3.Bacteria have a strong cell wall that protects them from environmental stress.

细菌有一个坚固的细胞壁，可以保护它们免受环境压力。

4.When studying plant biology, the cell wall is a crucial component to examine.

在研究植物生物学时，细胞壁是一个关键的组成部分。

5.The rigidity of the cell wall helps maintain the shape of the cell.

细胞壁的刚性有助于维持细胞的形状。

作文

The structure of life is often complex and fascinating, with various components working together to sustain living organisms. One such crucial component is the cell wall, which plays a vital role in maintaining the integrity and functionality of cells, particularly in plants, fungi, and some bacteria. The cell wall is a rigid outer layer that surrounds the cell membrane, providing support and protection. Unlike animal cells, which only have a flexible cell membrane, plant cells are fortified with this additional layer that gives them shape and resilience.The primary function of the cell wall is to provide structural support. It acts like a protective barrier, preventing the cell from bursting under pressure due to osmotic forces. This is especially important for plant cells, which often experience high internal pressure as they take up water through osmosis. The rigidity of the cell wall allows plants to stand upright and reach toward sunlight, which is essential for photosynthesis.Moreover, the cell wall is composed of cellulose, a complex carbohydrate that forms long chains, creating a strong framework. This composition not only provides strength but also contributes to the plant's ability to grow tall and withstand environmental stresses such as wind and rain. In addition to cellulose, the cell wall may contain other substances like lignin and pectin, which further enhance its strength and flexibility.In fungi, the cell wall is primarily made of chitin, another polysaccharide that offers similar protective functions. This difference in composition between plant and fungal cell walls highlights the diversity of life forms and their evolutionary adaptations. Bacterial cell walls are composed of peptidoglycan, which is essential for their survival and shape. Understanding these differences is crucial in fields like microbiology and medicine, as it helps in developing antibiotics that target bacterial cell walls without harming human cells.The cell wall also plays a role in communication between cells. It contains various proteins and carbohydrates that can interact with other cells and the environment. These interactions are vital for processes such as growth, development, and defense against pathogens. For instance, when a plant is under attack by pests or diseases, the cell wall can trigger defense mechanisms to protect the plant from further damage.In summary, the cell wall is an essential feature of many living organisms, particularly plants and fungi. Its primary functions include providing structural support, protecting against environmental stresses, and facilitating communication between cells. By understanding the significance of the cell wall, we gain insights into the complexities of life and the intricate systems that sustain it. This knowledge not only enhances our appreciation for the natural world but also informs scientific research and agricultural practices aimed at improving crop resilience and health.

生命的结构往往复杂而迷人，各种成分共同作用以维持生物体的生存。其中一个重要组成部分是细胞壁，它在维持细胞的完整性和功能方面发挥着至关重要的作用，特别是在植物、真菌和某些细菌中。细胞壁是包围细胞膜的刚性外层，为细胞提供支持和保护。与仅有灵活细胞膜的动物细胞不同，植物细胞则被这一附加层强化，使其具有形状和韧性。细胞壁的主要功能是提供结构支持。它就像一个保护屏障，防止细胞因渗透力而破裂。这对于植物细胞尤其重要，因为它们在通过渗透吸水时，内部压力往往很高。细胞壁的刚性使植物能够直立生长并向阳光伸展，这对光合作用至关重要。此外，细胞壁由纤维素组成，这是一种复杂的碳水化合物，形成长链，创建出强大的框架。这种组成不仅提供了强度，还促进了植物在高风和降雨等环境压力下的生长能力。除了纤维素，细胞壁中可能还含有木质素和果胶等其他物质，进一步增强其强度和灵活性。在真菌中，细胞壁主要由几丁质构成，这种多糖提供类似的保护功能。这种植物和真菌之间的组成差异突显了生命形式的多样性及其进化适应性。细菌的细胞壁由肽聚糖组成，这对它们的生存和形状至关重要。理解这些差异在微生物学和医学等领域至关重要，因为这有助于开发针对细菌细胞壁的抗生素，而不会伤害人类细胞。细胞壁还在细胞之间的通信中发挥作用。它包含各种蛋白质和碳水化合物，可以与其他细胞和环境相互作用。这些相互作用对于生长、发育和抵御病原体等过程至关重要。例如，当植物受到害虫或疾病攻击时，细胞壁可以触发防御机制，以保护植物免受进一步损害。总之，细胞壁是许多生物体（特别是植物和真菌）的一个重要特征。它的主要功能包括提供结构支持、保护免受环境压力以及促进细胞之间的通信。通过理解细胞壁的重要性，我们可以深入了解生命的复杂性及其维持所需的精密系统。这一知识不仅增强了我们对自然世界的欣赏，也为科学研究和农业实践提供了信息，旨在改善作物的韧性和健康。