Briefly describe the primary structure of collagen, a- keratin and B-keratin.
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Briefly describe the primary structure of collagen, a- keratin and B-keratin.
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- Both α-keratin and collagen are examples of fibrous proteins. What is a fibrous protein? In 4-6 sentences, compare and contrast the structures of α-keratin and collagen. A)Will have the greatest absorbance at 280 nm B)Is the most negatively charged at pH7 C)Is the most positively charged at pH7Name two types of soluble fiber and their sources.63. Which of the following statements is/are true about collagen? a) It gives epithelial layers tensile strength and allows them to stretch. b) It requires hydroxylation of particular amino acids post-translationally. c) It is present in different epithelial cell types in different forms, such that it serves as a usual marker for the origin of difference cancers. d) a and c e) a, b and c
- What is the repeating sequence of collagen and how is it essential to the structure of the triple coils of collagen fibers?List the steps of collagen assembly and include the location of each stepWhat is one feature of fibrillar collagen that contributes to its strength? They form crosslinks between glycine and alanine residues on adjacent collagens. They form crosslinks between lysine and hydroxylysine residues on one collagen molecule. They form crosslinks between glycine and alanine residues on one collagen molecule. They form crosslinks between lysine and hydroxylysine residues on adjacent collagen molecules.
- What are the three types of protein fibers? Describe their functions and characteristics.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.Compare collagen and myoglobin with regards to each of the following: (a) secondary structure; (b) water solubility; (c) function; (d) location in the body.
- T/F Type I collagen fibers, that consist of collagen triple helices aligned side-by-side, are strengthened by covalent cross-links between amino acid side chains of different collagen triple helices. True O FailseWhat is the difference between Lamin A protein and progerin? briefly describe the difference in their functions ( three sentences or less) Derivatives of which amino acid are critical for crosslinking of keratin fibers? Select one: a. Gly b. cystine c. hydroxyproline d. lysine e. Pro