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Inquiry into Life Twelfth Edition
Inquiry into Life Twelfth Edition

... • LTR are lacking in most retrotransposons • Most abundant type lacking LTR are LINEs and LINE-like elements – Long interspersed elements – Encode an endonuclease that nicks target DNA – Takes advantage of new DNA 3’-end to prime reverse transcriptase of element RNA – After 2nd strand synthesis, ele ...
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statgen10a
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DNA Replication - :: FAPERTA UGM
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DNA - PBworks
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... the order of the bases in one strand determines the order of the bases in the other strand. ...
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... reasons. Bacteria must exploit the resources of a changing environment. If they do not adapt, they die, but maintaining numerous unused enzymes is metabolically expensive. Multicellular eukaryotes must be protected from those changes. The hallmark of multicellular organisms is homeostasis: maintaini ...
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Primary transcript



A primary transcript is the single-stranded ribonucleic acid (RNA) product synthesized by transcription of DNA, and processed to yield various mature RNA products such as mRNAs, tRNAs, and rRNAs. The primary transcripts designated to be mRNAs are modified in preparation for translation. For example, a precursor messenger RNA (pre-mRNA) is a type of primary transcript that becomes a messenger RNA (mRNA) after processing.There are several steps contributing to the production of primary transcripts. All these steps involve a series of interactions to initiate and complete the transcription of DNA in the nucleus of eukaryotes. Certain factors play key roles in the activation and inhibition of transcription, where they regulate primary transcript production. Transcription produces primary transcripts that are further modified by several processes. These processes include the 5' cap, 3'-polyadenylation, and alternative splicing. In particular, alternative splicing directly contributes to the diversity of mRNA found in cells. The modifications of primary transcripts have been further studied in research seeking greater knowledge of the role and significance of these transcripts. Experimental studies based on molecular changes to primary transcripts the processes before and after transcription have led to greater understanding of diseases involving primary transcripts.
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