Question

21. Which of the following would NOT change the structure and function of a protein A Methylation of a protein B. Lipid modification of a protein C Change in the length of the Poly A tail of the mRNA transcript encoding a protein D. Change in the position of reactive amino acids E. Proteolysis 22. Two peptides have almost the exact same primary structure, except that one has about 10 fewer amino acids at the amino-terminus (N-terminus) of the protein. What is a possible explanation for the protein that is missing those 10 amino acids? A. An alternative Poly-A tail addition site B. Leaky scanning occurred C. Differential glycosylation of the protein D. Inefficient folding by chaperone proteins E. All of the above are correct answers inter to the plasma membranes of stem cells where it Toll roliferation. Which of the

Answer 1

Question 21

Answer: The structure and function of protein is changed by various factors. Post-translational modifications such as methylation and lipid modification changes the structure and then function of the protein. Hence, option A and B are incorrect. Changes in the position of reactive amino acids changes the conformation of protein and function of the protein. Proteolysis involves breakdown of proteins in to peptides or amino acids that disrupt the protein structure and function. Hence, Option D and E are incorrect. mRNA contains poly A tail at the 3'end that protects the mRNA from degradation in cytoplasm and play a major role in transcription termination and nuclear export. Change in the length of poly A tail of the mRNA transcript does not change the structure and function of protein. Hence, option C is the correct answer.