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Concept explainers
A1.
To explain: How troponin molecules are positioned in every seventh actin molecules.
Introduction: The actin filament is made up of G-actin and polar in structure. It plays an important role in the structural framework that determines the shape of the cell. Hydrolysis of ATP and various actin-binding proteins control the assembly and disassembly of actin molecules in the actin filament.
A2.
To explain: The information about the binding of troponin to actin molecule shown by their regular arrangement in actin filament. Thus, troponin molecules are positioned in every seventh actin molecules.
Introduction: The actin filament is made up of G-actin and polar in structure. It plays an important role in the structural framework that determines the shape of the cell. Hydrolysis of ATP and various actin-binding proteins control the assembly and disassembly of actin molecules in the actin filament.
B. (i)
To explain: The results when actin filaments are mixed with troponin alone.
Introduction: The actin filament is made up of G-actin and polar in structure. It plays an important role in the structural framework that determines the shape of the cell. Hydrolysis of ATP and various actin-binding proteins control the assembly and disassembly of actin molecules in the actin filament.
B. (ii)
To explain: The results when actin filaments are mixed with tropomyosin alone.
Introduction: The actin filament is made up of G-actin and polar in structure. It plays an important role in the structural framework that determines the shape of the cell. Hydrolysis of ATP and various actin-binding proteins control the assembly and disassembly of actin molecules in the actin filament.
B. (iii) 1
To explain: The results when actin filaments are mixed with troponin plus tropomyosin and then added myosin.
Introduction: The actin filament is made up of G-actin and polar in structure. It plays an important role in the structural framework that determines the shape of the cell. Hydrolysis of ATP and various actin-binding proteins control the assembly and disassembly of actin molecules in the actin filament.
B. (iii) 2
To determine: Which effects are dependent on Ca2+ ions.
Introduction: The actin filament is made up of G-actin and polar in structure. It plays an important role in the structural framework that determines the shape of the cell. Hydrolysis of ATP and various actin-binding proteins control the assembly and disassembly of actin molecules in the actin filament.
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Chapter 17 Solutions
Essential Cell Biology (Fourth Edition)
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