asked in 科學動物學 · 1 decade ago

分子生物學的一些問題

1. 敘述何謂信息RNA(mRNA)?

2. 細菌RNA聚合酶的兩個主要元件與功能為何?

Update:

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  • Miffy
    Lv 7
    1 decade ago
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    1. 敘述何謂信息RNA(mRNA)?

    Messenger ribonucleic acid (mRNA) is a molecule of RNA encoding a chemical "blueprint" for a protein product. mRNA is transcribed from a DNA template, and carries coding information to the sites of protein synthesis: the ribosomes. Here, the nucleic acid polymer is translated into a polymer of amino acids: a protein. In mRNA as in DNA, genetic information is encoded in the sequence of nucleotides arranged into codons consisting of three bases each. Each codon encodes for a specific amino acid, except the stop codons that terminate protein synthesis. This process requires two other types of RNA: transfer RNA (tRNA) mediates recognition of the codon and provides the corresponding amino acid, while ribosomal RNA (rRNA) is the central component of the ribosome's protein manufacturing machinery.

    2. 細菌RNA聚合酶的兩個主要元件與功能為何?

    細菌的RNA聚合酶由兩個主要單元所組成,核心酵素 (core enzyme) (由四個次單元體組成) 與sigma次單元 (sigma subunit)。核心酵素主要負責RNA分子的合成,而sigma次單元則負責在轉錄作用開始時辨識啟動子的位置。sigma次單元可以辨識出位於編碼股 (非模板股) 上的啟動子區域內的兩段特殊的DNA序列。這兩段DNA序列分別稱作「-10序列 (-10 region)」與「-35序列 (-35 region)」。

    Source(s): Wikipedia, the free encyclopedia
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