BSC 310 Lecture Notes - Lecture 28: Signal Recognition Particle, Cell Membrane, Non-Coding Rna
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22 Feb 2019
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The introductory passage mentions that halomucin was predicted to contain a signal sequence and that later research found evidence of the protein outside of the H. walsbyi cell. What is the best description of a signal sequence?
Choose the best answer.
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Choose the best answer.
A) A signal sequence is 15-20 residues of a protein that has a central hydrophobic region and polar ends. It facilitates folding in order to make transport across the membrane easier. |
B) A signal sequence is 15-20 residues of a protein that has a central hydrophilic region and nonpolar ends. It is found only in bacteria, in which it marks a protein for export by the translocase system. |
C) A signal sequence is 15-20 residues of a protein that has a central hydrophobic region and polar ends. It hampers folding, which could prevent efficient secretion, and marks the protein for export by the translocase system. |
D) A signal sequence is 15-20 residues at the N terminus of a protein. It is found only in archaea, in which it marks a protein for export by the translocase system. |
E) A signal sequence if 15-20 residues at the C terminus of a protein. It is found in archaeans and in bacteria and marks proteins for export by the translocase system. |