2. Mitochondria and chloroplast are thought to have evolved into membrane-enclosed organelles in a very different fashio

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2 Mitochondria And Chloroplast Are Thought To Have Evolved Into Membrane Enclosed Organelles In A Very Different Fashio 1 (27.48 KiB) Viewed 28 times

2. Mitochondria and chloroplast are thought to have evolved into membrane-enclosed organelles in a very different fashion (See Figure 15-4, page 492How might the theory explain why it is that the members of the endo membrane system communicate with each other through vesicular transport whereas, mitochondria and chloroplast remain isolated from the rest 3. Most proteins are covalently modified in the ER. [Pages 507-509) a) Figure 15- 23 illustrates the glycosylation of a protein specific asparagine(ASN) as the growing peptide chain enters the ER lumen. How might this co-translational process assist in recognizing which ASN to glycosylate? b) Glycosylation involves the attachment of a pre-made oligonucleotides to a protein making it into a glycoprotein. From an energy efficiency and quality control perspective, what is the advantage of attaching a preassembled oligonucleotide instead of building it on the protein block by block (by the sequential addition of monosaccharides)? C) Explain the importance of chaperones proteins and the UPR in providing quality control for protein synthesis in the cell. (Refer to Figures 15-24 (p. 509) and 15-25 (p. 510)