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相关概念视频

Biodiversity and Human Values01:24

Biodiversity and Human Values

Human civilization relies on biodiversity in many ways. Sudden changes in species biodiversity result in environmental changes that can modify weather patterns and therefore human civilizations.
Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
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Gene Duplication and Divergence

The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...

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生物聚合物:演变,功能和意义

Kavita Matange, Eliav Marland1,2, Moran Frenkel-Pinter1,2

  • 1Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

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概括
此摘要是机器生成的。

生物聚合物脊柱显示出进化的标志,表明早期地球上的非达尔文过程. 这挑战了传统模型,并为生命和生物化学的起源提供了新的见解.

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科学领域:

  • 生物化学和进化生物学.
  • 天体生物学和生命起源研究研究.

背景情况:

  • 生物聚合物序列通过达尔文的过程进化,但骨干起源仍然不确定.
  • 了解生物聚合物的起源对于生物化学,生物学和天体生物学至关重要.

研究的目的:

  • 为了确定生物聚合物骨干特征是否表明进化起源.
  • 探索生物聚合物的前达尔文进化过程的机械模型.

主要方法:

  • 建立了区分进化和非进化化学物种的标准.
  • 编制和评估了聚,多核酸和多糖脊柱的共享特性.
  • 分析生物聚合物特性,包括动力捕捉,多功能,功能交换和互补性.

主要成果:

  • 生物聚合物骨干在动力学上被困,在热力学上不稳定,并表现出多功能和功能交换.
  • 生物聚合物表现出互补性,并进入反抗状态,在聚合后具有新兴性质.
  • 生物聚合物骨干表现出进化的标志,与纯粹的化学,物理或地质过程不一致.

结论:

  • 生物聚合物骨干很可能是由于早期地球上的水解应激驱动的非达尔文共同进化而产生的.
  • 进化的生物聚合物骨干促进了从化学到达尔文进化的过渡.
  • 这种模型挑战了传统的前生物合成观点,支持代化学雕塑和抽取.