FUNDAMENTALS OF BIOCHEMISTRY WPNG 1-SEME
5th Edition
ISBN: 9781119750192
Author: Voet
Publisher: WILEY
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Chapter 6, Problem 23CQ
Summary Introduction
Concept introduction: The secondary structure includes the formation of alpha helix and beta-pleated sheets. α helix is formed when the peptide bond (C=O) of the nth residue along the helical axis points toward the peptide N-H group of the (n+4)th residue. β sheets are formed, when the hydrogen bonds between the parallel and anti-parallel strands of protein.
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Draw a tripeptide of your choosing at pH 7. Have the N-terminus on the left and the C-terminus on the right. Then:
Draw a triangle around the α-carbons.
Draw a box around the R-groups.
Circle the atoms capable of hydrogen bonding.
Highlight the atoms involved in the formation of the peptide bonds.
What type of structure have you drawn? (primary, secondary, tertiary or quaternary protein structure).
2. For the flow of fluid over a flat membrane of length 10cm,
determine the length-average mass transfer coefficient. The
relevant properties of the system are u=0.01cm²/s, D=5 x 106
cm²/s, and v = 5.0 cm/s.
Background
Freezing isn't the only challenge in cryopreservation - thawing can
be just as difficult. A microwave oven seems like a nice solution,
since it deposits energy quickly and microwaves are non-ionizing
radiation (they do not cause DNA mutation). However, water
absorbs microwaves more effectively than ice does, meaning that
the portion of an organ that has already melted will get warmer at a
higher rate than the remaining ice – the opposite of what we want!
-
The transmission of radiation through a weakly absorbing material
such as ice or water can be modeled by Beer's law, which assumes
that the rate of absorption at a depth x is proportional to the local
radiation intensity I(x) times an absorption coefficient, which is often
written as μ or a or just µ). Noting that absorption decreases the
intensity, we can write a differential equation
a
Solving the differential equation with the boundary condition on the
surface being
gives the relationship
For a standard microwave oven…
Chapter 6 Solutions
FUNDAMENTALS OF BIOCHEMISTRY WPNG 1-SEME
Ch. 6 - Prob. 1ECh. 6 - Prob. 2ECh. 6 - 3. Why would you be unlikely to see an ? helix...Ch. 6 - 4. Calculate the length in angstroms of a...Ch. 6 - Prob. 5ECh. 6 - 6. Collagen IV, which occurs in basement...Ch. 6 - 7. Describe the primary, secondary, tertiary, and...Ch. 6 - 8. Explain why gelatin, which is mostly collagen,...Ch. 6 - Prob. 9ECh. 6 - 10. Is it possible for a native protein to be...
Ch. 6 - Prob. 11ECh. 6 - 12. (a) Is Trp or Gln more likely to be on a...Ch. 6 - 13. Classify the following proteins as ?, ?, or...Ch. 6 - 14. Classify the following proteins as ?, ?, or...Ch. 6 - 15. You are performing site-directed mutagenesis...Ch. 6 - 16. Laboratory techniques for randomly linking...Ch. 6 - Prob. 17ECh. 6 - 18. The genetically engineered proteins that...Ch. 6 - Prob. 19ECh. 6 - 20. Experiments in mice suggest that...Ch. 6 - 21. Helices can be described by the notation nm,...Ch. 6 - Prob. 22CQCh. 6 - 23. Which of the following polypeptides is most...Ch. 6 - 24. Which of the peptides in Problem 23 is least...Ch. 6 - Prob. 25CQCh. 6 - 26. What types of rotational symmetry are possible...Ch. 6 - Prob. 27CQCh. 6 - 28. Proteins in solution are often denatured if...Ch. 6 - 29. Given enough time, will all denatured proteins...Ch. 6 - Prob. 30CQCh. 6 - 31. Under physiological conditions, polylysine...Ch. 6 - 32. Would intrinsically disordered polypeptide...Ch. 6 - Prob. 33CQCh. 6 - Prob. 34CQCh. 6 - Prob. 35CQCh. 6 - 36. Not all heat shock proteins are chaperones;...Ch. 6 - 37. Protein denaturation can be triggered by a...Ch. 6 - 38. Explain why ? sheets are less likely to form...Ch. 6 - 39. The GroEL/ES cycle diagrammed in Fig. 6-45...Ch. 6 - Prob. 1MTE
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