BIOL10003 Lecture Notes - Lecture 28: Small Interfering Rna, Gene Expression, Noncoding Dna

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Lecture 28 - gene expression: dna, rna and polypeptide s. There are different sizes of chromosomes and densities of genes on them. 2% of genes encode proteins; the rest are unique non-coding dna, repetitive sequences and pseudogenes (2%) No cells express all their genes at any one time, they only require certain genes at different times. Genetic information - varying levels of compaction: less compact = more accessible = more expression. = differential gene expression; e. g. different genes turned on to make stem cells specific. Hundreds of copies (dna only has one copy per cell) Single stranded, unless part is in the secondary structure (hairpin) mrna messenger rna. Carries the dna code, complementary to the dna template. Template for protein synthesis trna transfer rna. Transfers amino acids to the ribosome floats around in the cytoplasm. Trna (cid:272)a(cid:374) o(cid:374)ly (cid:271)i(cid:374)d o(cid:374)e spe(cid:272)ifi(cid:272) a(cid:373)i(cid:374)o a(cid:272)id at the 3" e(cid:374)d (cid:894)al(cid:449)ays cca(cid:895) Trna matches an anticodon to the mrna template.

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