Bichemistry questions I\'m studying about protein structure and function. primar

Question

Bichemistry questions

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

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

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:

54) A list of residues that all can form side-chain hydrogen bonds or electrostatic ion pairs with the side chain of an E residue at pH 11 a. None of the below b. V, G, F. A C. K, D, S. Q d. Y. W, I, L e. T, Q, R, H 55) Which set of side chains are all charged at pH-5? a. H, K, E, D - C. A,w, l, L d. E, C, R, D e. none of the above 56) The 2d to last carbon on lysine is designated the carbon b, c. d. 8 e. 57) Which names could not represent a peptide? (mark all that apply) a. THOMASJEFFERSON b. AISHAWARYARA C. THOMASPAINE d. MERYLSTREEP e. all of the above are correct

Explanation / Answer

54. e. T, Q, R, H

At pH 11, E will be negatively charged so it can accept hydrogens, which means it will act as an hydrogen bond acceptor. Only T, Q, R, H pair has hydrogen bond donor atoms.

55. a. H, K, E, D  

All the acidic and basic amino acids will be charged at pH 5. For example, Aspartic acid has one carboxylic acid group which will be negative charged at pH 5. In basic amino acids, the primary/secondary amines will be protonated much above pH 5.

56. d. delta

That blue coloured lysine carbons in your image will be labeled as alpha, beta, gamma, delta and epsilon. Here second to last is delta. Remember: Only carbons are named with that.

57. a and c

B, J, O, U, X and Z letters doesn't represent amino acids.

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