Which statement is false? ○ Each chain of collagen adopts a right-handed helix ○ Disulfide linkages modulate the properties of keratin structure. O Modified lysine residues can enhance collagen's durability Silk resists stretching because of its ẞ conformation ○ The polypeptides in a-keratin are mainly in the a-helical conformation

Which statement is false? ○ Each chain of collagen adopts a right-handed helix ○ Disulfide linkages modulate the properties of keratin structure. O Modified lysine residues can enhance collagen's durability Silk resists stretching because of its ẞ conformation ○ The polypeptides in a-keratin are mainly in the a-helical conformation

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter31: Animal Tissues And Organ Systems

Section: Chapter Questions

Problem 4SQ: A rubbery secreted matrix of glycoproteins and collagen surrounds living cells in ______ a. bone b....

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Both α-keratin and collagen are examples of fibrous proteins. What is a fibrous protein? Compare and contrast the structures of α-keratin and collagen.
Both alpha keratin and collagen are fibrous proteins. However, the hydrogen bonding pattern is different between the helices of the respective proteins. What is the major difference?
Both a-keratin and collagen are fibrous proteins.however,the hydrogen bonding pattern is different between the helices of the respective proteins.what os the major difference?
The shape of hair is determined in part by the pattern of disulfide bonds in keratin, its major protein. How can curls be induced?
3) Collagen is a very important structural protein in animals. Discuss the various parts of the body in which collagen is an important structural molecule and what its function is at each body location.
What could be the reason why hydroxylation of proline residues is critical to the structural integrity of collagen? Select the correct response The hydroxyl moities in Pro form disulfide bonds which stabilize collagen structure. The hydroxyl moities in Pro form ionic bonds (salt bridges) which stabilize collagen structure. The hydroxyl moities in Pro form hydrophobic interactions which stabilize collagen structure. The hydroxyl moities in Pro form peptide bonds which stabilize collagen structure. The hydroxyl moities in Pro form H-bonds which stabilize collagen structure.
Classify the fold of each protein. Classify the fold of each domain asall a (or mostly a), all b (or mostly b), a/b, or a+b.. 1. Firmicute collagen-binding protein (1FCB): 2. Bat glycosyltransferase (2BGT): 3. Proteobacterial nitrite sensor (3PNS):
Which wool fiber properties would be changed if the fiber had β-keratin instead of α-keratin? Explain the effect of fineness of wool fiber on air permeability of woolen fabric. Compare the protein and cellulosic fibers in terms of strength, flexibility, acid / alkali response and thermal conductivity. Which parameters are considered when evaluating commercial importance of a natural fiber?
Briefly describe the primary structure of collagen, a- keratin and B-keratin.
How do the interchain hydrogen bonds and glycosylation contribute to the stability of collagen?
The core of pectin molecules is a polymer of a (1®4)-linked D-galacturonate. Draw one of its residues.
Dinah had her curly hair rebonded. One chemical is put on her hair to break the disulfide bonds that give the hair stands their shape (curly) and a second chemical is used to reform the disulfide bonds to hold the hair in a straight position. a. What level(s) of protein structure is/are affected by these processes? b. Why doesn’t the hair stay straight forever after this treatment