The first amino acid in protein synthesis inthe chloroplast is N-formylmethionine. What is the significance ofthis fact?
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The first amino acid in protein synthesis in
the chloroplast is N-formylmethionine. What is the significance of
this fact?
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- . In glycoproteins, what are the three amino acids to whichthe carbohydrate groups are most frequently linked? Towhat functional group is the glycan linked in each case?Draw the amino acid cysteine (R = CH2SH) at pH 7.At pH 7, tryptophan crosses a lipid bilayer at about onethousandththe rate of indole, a closely related compound: Suggest an explanation for this observation.
- What would be the molecular sequence of the amino acid chain asp-leu-leu? (i.e. draw the whole sequence out as molecules joined together)A chromophore is the component of a molecule that gives itits color. What properties of chromophores are responsiblefor this phenomenon?Residues such as valine, leucine, isoleucine, methionine, andphenylalanine are often found in the interior of proteins,whereas arginine, lysine, aspartic acid, and glutamic acid areoften found on the surface of proteins. Suggest a reason forthis observation. Where would you expect to find glutamine,glycine, and alanine?
- Starting from glutamine, glycine, aspartate, N 10-formyi-THF, how many ATP- equivalents are required for purine nucleotide synthesis? 2 8 4 6Which generic class of reaction results inthe phosphodiester bonds of nucleic acids,analogous to the peptide bonds of polypeptides?Explain at least three functions that lipids serve in plants and/or animals.
- why are all 20 amino acids important for protein synthesisIn what naturally occurring nucleic acids would you expectto find A-form helices, B-form helices, Z-form helices, nucleosomes,and circular DNAMany people who are lactose intolerant can eat yogurt, which is prepared from milk curdled by bacteria, without any digestive problems. Give a reason why this is possible. (Hint: Read the label on each of several yogurt containers. Do the ingredients make a difference?)