Homework Answers
The phi = 0 and psi = 0 regions are not populated because these regions are sterically not allowed as the involved atoms will come too close to each other and will lead to unfavourable steric interaction destabilising the secondary structure of the polypeptide.
Postive phi values are allowed for polyglycine unlike other aminoacids as glycine does not have a side chain and that makes the polypeptide chain highly flexible and it can attain rotation angles otherwise very difficult to acquire because of side-chain interference.
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Consider the Ramachandran Plot for polyglycine: Why is the phi = 0 and psi = 0...
The Ramachandran plot represents the phi/psi dihedral angles at each backbone peptide bond in a protein....
The Ramachandran plot represents the phi/psi dihedral angles at each backbone peptide bond in a protein. Which one of the following statements best represents the changes observed in a dihedral angle in the transition of a prion protein from alpha-helical to beta sheet? A. the Ramachandran plot would be identical since the amino acid sequence remains the same. B. The phi/psi angles would change from about -60 and -50 to -140 and 135 respectively. c. The phi/psi angles would change...
Why will the phi/psi angles of an amino acid in an alpha-helix be different from the...
Why will the phi/psi angles of an amino acid in an alpha-helix be different from the phi/psi angles of an amino acid in a beta-sheet? How are phi/psi angles possible fro Pro and for Gly different from those of other amino acids?
Please please help!! Consider three dipeptides: i) S-G-K ii) I-K-Y iii) V-P-T Draw peptide (i)...
Please please help!! Consider three dipeptides: i) S-G-K ii) I-K-Y iii) V-P-T Draw peptide (i) illustrating the resonance structures that limit free rotation around the peptide bonds on each side of the center amino acid Show which bonds have the angles we call phi () and psi (). This peptide represents a normal peptide on the Ramachandran diagram. Draw peptides (ii) and (iii) and label them with phi () and psi () (don’t do the resonance structures again). Which...
The question is 1.3 but the Psi(x,0) and phi(k) are given in the previous two parts...
The question is 1.3 but the Psi(x,0) and phi(k) are given in the
previous two parts
1.1 Consider a free particle in one-dimension with a wavefunction at t-0 Show that Ψ is normalized. 1.2 Show that the momentum wavefunction is Notice that lin (k-ak-k) 1.3 we can find Ψ(r) at any time t by: (ie. Ψ(x,t) is given by the Schrodinger' egn and the initial condition Ψ(x Show that iht 2mA イAr /2 2mA
Use the plot pictured to the right from your textbook for the next 3 questions 18....
Use the plot pictured to the right from your textbook for the next 3 questions 18. This is a representation of the Ramachandran plot for: +180 a. L-Ala-L-Ala. b. L-Ala-L-Pro c. Gly-Gl;y d. L-Pro-L-Pro e. Every possible protein 0 19. Using this plot, the values should be allowed for a beta sheet -180 -180 с. ф 75°, -75° d. All of (a.), (b.), and (c.) above are correct and allowed for beta +180 Figure 4.20 The Molecules of Lifet Garland...
Draw a Ramachandran plot and mark the location of each of the following coordinates. Then indicate...
Draw a Ramachandran plot and mark the location of each of the following coordinates. Then indicate which type of secondary structure would be formed if each particular coordinate pair of and psi values were repeated? A) Psi:120 degree psi: 120 degree B) Psi:180 degree psi: 0 degree C) Psi:180 degree psi: 180 degree D) Psi:0 degree psi: 180 degree E Psi:-60 degree psi: -40 degree
Scientist interested in designing protein-based biosensors determined the three-dimensional structure of a bacterial membrane protein that...
Scientist interested in designing protein-based biosensors
determined the three-dimensional structure of a bacterial membrane
protein that allows mainly hydrophobic solutes to enter the
periplasmic space. The Ramachandran plot based on the experimental
structure is shown below. The colored regions indicate allowed
conformational space while the observed data points are shown by
small dots.
The same protein was also characterized by CD measurements.
Unfortunately, the graduate student assigned to the task measured
CD spectra of three different proteins on the same...
Please show all work 24.4 Consider a stress state where ?,-0, ?,--8,000 ps, and ??,--4,000 psi....
Please show all work
24.4 Consider a stress state where ?,-0, ?,--8,000 ps, and ??,--4,000 psi. Calculate the magnitude and direction of the principal stresses and the maximum value of shear stress. (Ans. ?? 1,657 psi, ?2 -9,657 psi, ?,--22.500-max-5,657 psi)
i can't understand the reference about phase. Why the phase is zero when z(w)>=0 and why...
i can't understand the reference about phase. Why the phase is
zero when z(w)>=0 and why it is +-phi when z(w)<0
Z(2) sin(22/2) 12/2 Given that Z(92) is real, its phase is either zero when Z(92) > 0 and when Z(92) < 0 (using these values so that the phase is an odd function of S2). Since z(t) = xy(t +0.5), then Z(2) Xi (S210.50 so that X1(92) = -0.52Z(2)
Explain why α-helices are most commonly observed in transmembrane protein sequences when the distance from one...
Explain why α-helices are most commonly observed in
transmembrane protein sequences when the distance from one side of
a membrane to the other can be spanned by significantly fewer amino
acids in a β-strand conformation.
Match the items in the left column to the appropriate blanks in
the sentences on the right.
prevents within a The structure of an a-helix promotes stretch of amino acids, and at the same time contiguous interactions with other important molecules involved in in the...
The question is 1.3 but the Psi(x,0) and phi(k) are given in the
previous two parts
1.1 Consider a free particle in one-dimension with a wavefunction at t-0 Show that Ψ is normalized. 1.2 Show that the momentum wavefunction is Notice that lin (k-ak-k) 1.3 we can find Ψ(r) at any time t by: (ie. Ψ(x,t) is given by the Schrodinger' egn and the initial condition Ψ(x Show that iht 2mA イAr /2 2mA
Use the plot pictured to the right from your textbook for the next 3 questions 18. This is a representation of the Ramachandran plot for: +180 a. L-Ala-L-Ala. b. L-Ala-L-Pro c. Gly-Gl;y d. L-Pro-L-Pro e. Every possible protein 0 19. Using this plot, the values should be allowed for a beta sheet -180 -180 с. ф 75°, -75° d. All of (a.), (b.), and (c.) above are correct and allowed for beta +180 Figure 4.20 The Molecules of Lifet Garland...
Draw a Ramachandran plot and mark the location of each of the following coordinates. Then indicate which type of secondary structure would be formed if each particular coordinate pair of and psi values were repeated? A) Psi:120 degree psi: 120 degree B) Psi:180 degree psi: 0 degree C) Psi:180 degree psi: 180 degree D) Psi:0 degree psi: 180 degree E Psi:-60 degree psi: -40 degree
Scientist interested in designing protein-based biosensors
determined the three-dimensional structure of a bacterial membrane
protein that allows mainly hydrophobic solutes to enter the
periplasmic space. The Ramachandran plot based on the experimental
structure is shown below. The colored regions indicate allowed
conformational space while the observed data points are shown by
small dots.
The same protein was also characterized by CD measurements.
Unfortunately, the graduate student assigned to the task measured
CD spectra of three different proteins on the same...
Please show all work
24.4 Consider a stress state where ?,-0, ?,--8,000 ps, and ??,--4,000 psi. Calculate the magnitude and direction of the principal stresses and the maximum value of shear stress. (Ans. ?? 1,657 psi, ?2 -9,657 psi, ?,--22.500-max-5,657 psi)
i can't understand the reference about phase. Why the phase is
zero when z(w)>=0 and why it is +-phi when z(w)<0
Z(2) sin(22/2) 12/2 Given that Z(92) is real, its phase is either zero when Z(92) > 0 and when Z(92) < 0 (using these values so that the phase is an odd function of S2). Since z(t) = xy(t +0.5), then Z(2) Xi (S210.50 so that X1(92) = -0.52Z(2)
Explain why α-helices are most commonly observed in
transmembrane protein sequences when the distance from one side of
a membrane to the other can be spanned by significantly fewer amino
acids in a β-strand conformation.
Match the items in the left column to the appropriate blanks in
the sentences on the right.
prevents within a The structure of an a-helix promotes stretch of amino acids, and at the same time contiguous interactions with other important molecules involved in in the...
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