Bichemistry questions Can somebody help me answer the questions above, and expla
ID: 54402 • Letter: B
Question
Bichemistry questions
Can somebody help me answer the questions above, and explain how did you do it so I can understand?
For question 62, 64, 65, use the tripeptide VDF to answer the question.
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:
62) For the ipeplideVDF, how many chira eters are therne? b. 2 C. 1 d. 0 e. none of these. a. 3 64) The torsion angle involves the following main-chain atoms. a. N(i-1), Ca(i-1)Cp (i), C(i) b. Ca(i), N(), C(i), Cali-1) c. C(i-1), N(), Ca(), CO) d. N(U), Cal), C(i) N(+1) e. None of the above 65) The torsion angle involves the f ollowing main-chain atoms: a. N(i-1), Cal-1), CB (), CO b. Ca(), N(), C(U), Ca(i-1) e. None of the aboveExplanation / Answer
62. The correct answer is option a.
The tripeptide VDF has 3 chiral centres.
64. The correct answer is option e.
phi () is the N(i-1),C(i),Ca(i),N(i) torsion angle.
65. The correct answer is option e.
psi () is the C(i),Ca(i),N(i),C(i+1) torsion angle.
67. The correct answer is option e.
The interaction between 2" and 3" structures are similar to hydrophobic interactions with water.
68. The correct answer is option b.
For most amino acids the +phi, - psi quadrant is most disallowable.
69. The correct answer is option d.
Residues in helical conformation are in -phi, +psi quadrant.(Though helices are also found in -psi,-phi and +psi, +phi qudarants.)
70. The correct answer is option d.
Residues in sheet conformation are in -phi, +psi quadrant.
71. The correct answer is option a.
Left handed helices are found in +phi,+psi quadrant.
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