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Unformatted text preview: Ch. 15_HW ans key MCQ: 1) C 2) B 3) A 4) C 5) C 6) E 7) C True/ False: 1) F 2) T 3) F 4) T 5) T 6) F 7) F SQ: 1) A) Secondary structure: through interaction between neighboring amino acids, the polypeptide chain folds and twists into a secondary structure. Two types of secondary structure; a) alpha helix and b) beta-pleated sheet Alpha helix is a right-handed helix being composed of spiral chain of amino acids stabilized by hydrogen bonds. Beta-pleated sheets have folded polypeptide chains running either in a parallel or anti-parallel fashion against each other. B)Polyribosome: In both pro- and eukaryotic cells, mRNA molecules are translated simultaneously by multiple ribosomes. The resulting structure, an mRNA with several ribosomes attached is called polyribosome. C) SD sequence: In bacteria, the mRNA transcript contains a sequence of about 6 ribonucleotides, all purines (A and G) upstream of the AUG start codon. This sequence is called Shine-Dalgarno sequence and it base-pairs with a sequence of bases found near the 3 end of the 16s rRNA. This base-pairing helps in attachment of mRNA and a sequence of bases found near the 3 end of the 16s rRNA....
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This note was uploaded on 12/13/2011 for the course BIO 325 taught by Professor Saxena during the Fall '08 term at University of Texas at Austin.
- Fall '08