rest Form B a Which of the following sequences of polypepide cannot 14. N-Lys-Se

Question

rest Form B a Which of the following sequences of polypepide cannot 14. N-Lys-Ser-Thr-C b. C-Lys-Ser-Phe-N c. N-L.ys-Pro-Thr-C d. N-Arg-Ala-Leu-C e. None of the above - they can all be part of an alpha-helis be part of an alpha-helix? 15. Which of the following does not contribute to the overall structure of proteins? a. Charge differences between R groups b. The formation of disulfide bonds between serines c. Interactions between R groups and the environment d. The N-H from the peptide backbone e. None of the above-they all contribute 16. Which of the following cell membrane components increase a. Carbohydrates b. b. Phospholipids c. Integrins e. None of the above membrane stiffness? 17. Which of the following statements about osmosis is true? a. Water will move across a membrane to a region with less solute. b. Water will move across a membrane to a region with more solute c. Water will move across a membrane in a manner independent of solute concentration. d. Solutes will move across a membrane to a region with more water. e. Solutes will move across a membrane to a region with less water 18. Which of the following statement is true? a. All proteins have primary structures. b. All amino acids in polypeptides are involved in secondary structures. c. All tertiary structures are fixed and thus cannot accommodate changes to their structure d. All quaternary structures require disulfide bridges. e. All of the above seal intercellular spaces, and reinforce attachments 19. In cell junctions, for communication between cells. a. desmosomes; tight junctions; gap junctions b. tight junctions; desmosomes; gap junctions c. cell recognition molecules; adhesion molecules; tight junctions d. junction proteins; adhesion molecules; connexins e. desmosomes; gap junctions; tight junctions 3

Explanation / Answer

14) Alpha helix form a part of secondary structure of proteins. The amino acids that have the propensity to form alpha helix include methionine, alanine, leucine, glutamate and lysine (MALEK group). The amino acid proline cannot be found in alpha helix because it cannot form hydrogen bonds as well as it cannot rotate around it's N-C bond. So, the answer for this question is option c (N-Lys-Pro-Thr-C).

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