Bichemistry questions Can somebody help me answer the questions above, and expla

Question

Bichemistry questions

Can somebody help me answer the questions above, and explain how did you do it so I can understand?

I'm studying about protein structure and function. primary, secondary, tertiary, torsion angles, phi, and psi

The alphabets represent the amino acids. For example, V stands for Valine, D stands for Aspartate, I stands for Isoleucine, S stands for Serine, etc.

you can look at the structure of the amino acids here:

Which of these lonizable states would be seen at the same time on a polypeptide RGVF? (-1m = Imidazole; "Gus Guan!dino) a. -COOH 9) C. -OH &-COO- e. none of the above above Ccoo. 2 2c 10) For a 1 liter (L) solution of 220 mM MOPS (a weak ackd that has a pKa 7.15) at pH 8.63, where you have added 1 M HCI to a pH of 8.15. What is the concentration of [HA] after adding HCI? a. I b. 10 mM C. 20 mM d. 200 mM e. none of the above 11) which of the bolowing statements are true hbout hydrogen bonds? (mark all hat apply) a, All of the below are true Hydroxyl groups act as both hydrogen bond donors and acceptors Nitrogees are hydrogen bond donors in proteins. Methyleie groups make strong hydrogen bond donors e. Hydrogen bond acceptor groups are usualy nitrogens or oxygens with paired electrons 12) Which of the following statement(s) Is/are true about the hydrophobie effect effect Involves a decrease of the entropy of the system a. The hydrophoblc b. Proteln folding Iinvolves the Increase In entropy of the water c. Burial of polar reskdues results trom the hydrophobic effect d. MG Is dominated by the &H; of the hydrogen bondling interactions e. none of the above 13) Comparing the Isoelectric points (ol) for the amino ackd Glu and the following peptide AVILFWEG (mark all that apply) a. They are different because there are more lonizable groups in the peptide b. They cannot be computed due to the non-polar groups hey are both the same due to the same sidechain pKa's d. They are different because there are differences In pKas of the the hydroxyl groups e. They are different because of the pKa on the Gly reskdue 14) Which of the following statements is right about the peptide bond a. Bond Involves the alpha carbon to the skde-chain beta carbon b. It is tound only In the trans conformation for al amino ackds c. Forms from two amino ackds via a oondensation reaction d. Is found 10% in trans for only the amino acid proline. e. Possesses partial double bond character due to resonance with the side-chah carboxyl carbon

Explanation / Answer

9.a

10.b

11.b,e

12.a

13.c

14.a,b,c,d,e

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