the C o aroup on R groups orn t group on one amino acid and the C-O group on ano

Question

the C o aroup on R groups orn t group on one amino acid and the C-O group on anothen other causing the sheet to form with the R groups on csde -C vepest of the peptide backbone, allowing for repularlgy spaced pepeide bords betwom dlain 22 which of ehe tollowing junctional componests belp to fimmly nchor cells togrthen, therely providing mechanical stabillity for tissues? h kerstin fibers c tight junctional proteins t fom quilhed seals e none of the above 23. Which of the following statements is true about the three-dimensional structure of a protein a If you disturb the hydrogen bonding, cely the primary structure will be let b. If you disturb the van der Wasls forces, only the quaternary structure will be affected C. Tertiary and quaternary structures are held together by similar types of interactions d. All proteins have primary, secondary, tertiary, and quatermary structure e All of the above 24. If red blood cells are exposed to a hypotonic solution, the cells will a shrink and collapse b. release water out of the cell along its concentration gradient c absorb water from the plasma and eventually may even buarst d allow water to move through protein channels in the cell membrane in both directions e none of the above. 25. During the formation of a peptide linkage, a(n) a molecule of water is formed b. disulfide bridge c. hydrophobic bond d. hydrophilic bond e ionic bond

Explanation / Answer

20. In an alpha helix , which is a secondary structure, it is stabilized by- Hydrogen bonding of N-H group on one amino acid and C=O on other.

So, ( b ) is the correct option.

21. A beta pleated sheet is stabilized by - Hydrogen bonding of polar and charged side chains of amino acids.

So (a) is correct option.

22. Here option (c) is correct , tight junctonal proteins that form quilted seals.

23. In this question the correct option is (e) because all of the above statements are true about the three dimensional structure of protein.

24. Hypotonic solution means , the concentration of solute is low which means concentration of water is high. And, the RBCs have lower water concentration , it will absorb water from plasma and will eventually burst.

So option (c) is correct.

25.During the formation of peptide linkage , a molecule of water is formed

So option (a) is correct .

Hope it explains your query, Good luck !!!!

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