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€FHsr` &amp
€FHsr` &

... transports amino acids to the ribosomes where they witl be assembted into a protein. A third type of RNA is caLled ribosomal RNA (rRNA), which combines with proteins to form the rjbosomes. Att RNA molecutes are made from DNA in a process calted transcription. During transcription, the two strands of ...
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... Bacteria: methylation distinguishes self from foreign DNA (methylation after synthesis) base-base mismatch repair (nonmethylated strand scanned) Higher Eukaryotes: 5-methylcytosine is only methylated form found predominately at CpG role in gene expression (undermethylated  increase in transcription ...
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Helicase



Helicases are a class of enzymes vital to all living organisms. Their main function is to unpackage an organism's genes. They are motor proteins that move directionally along a nucleic acid phosphodiester backbone, separating two annealed nucleic acid strands (i.e., DNA, RNA, or RNA-DNA hybrid) using energy derived from ATP hydrolysis. There are many helicases resulting from the great variety of processes in which strand separation must be catalyzed. Approximately 1% of eukaryotic genes code for helicases. The human genome codes for 95 non-redundant helicases: 64 RNA helicases and 31 DNA helicases. Many cellular processes, such as DNA replication, transcription, translation, recombination, DNA repair, and ribosome biogenesis involve the separation of nucleic acid strands that necessitates the use of helicases.
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