Which of the following is incorrect about the collagen structure? The covalent cross-links between the individual chains stabilize the collagen structure b. None; all the other choices are correct The helical structure is cross-linked (with covalent bonds) at both ends d. Gly residues are all located in the center of the helix (i.e. between the individual chains) a. C.
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- Which of the following statements are true for both actin and tubulin: a. Both actin and tubulin filaments are hollow. b. Both actin and tubulin are structural proteins capable to form filaments that can grow from both (+) and (-) ends. c. Both actin and tubulin require GTP for polymerization into filaments. d. Both actin and tubulin require ATP for polymerization into filaments.Which of the following is false statement? a. alpha-Keratin is alpha helical b. alpha-Keratin is beta pleated structure c. Collagen is alpha helical d. Hemoglobin has a quaternary structure e. Two of the choices are correctWhich of the following are differences between the assembly processes of intermediate filaments versus that of actin microfilaments? A. New subunits are added internally to the intermediate filament rather than at the ends B. Assembly requires GTP rather than ATP C. Intermediate filaments are assembled from multiple tetramers rather than from monomers. D. A and B E. A and C
- Collagen and keratin are examples of what type of protein? A. fibrous B. simple C. globular D. conjugatedWhich of the following statements regarding adenosine phosphates is incorrect? a) ATP, ADP and AMP are all examples of adenosine phosphates. b) All adenosine phosphates contain a pentose ribose sugar. c) All phosphate ions in adenosine phosphates are joint together by a phosphoanhydride bond. d) All adenosine phosphates releases energy upon cleavage of phosphate group.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 pH7
- Which of the following best describes collagen? Select the correct responses): It is a sinistral super helix that is formed from three sinistral helices. It is a sinistral super helix that is formed from three dextral helices. • It is primarily made up of chiral and cyclic amino acids. It is primarily made up of chiral and acyclic amino acids. It is a dextral super helix that is formed from three sinistral helices. • It is primarily made up of achiral and cyclic amino acids. ]It is primarily made up of achiral and acyclic amino acids. • It is a dextral super helix that is formed from three dextral helices.What 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.Which of the following has a triple helix structure? α-keratin. Collagen. Amyloid. Silk fibroin. Terpenoids.
- Collagen is produced as procollagen and then processed to collagen extracellularly. What would happen if procollagen was processed within the cell?Which of the following statements about collagen is incorrect?Microfilaments are long filamentous proteins made up of many globular proteins. What main protein are microfilaments composed of?