Homework Answers
True statement for myosin are :
- The myosin-actin reaction cycle is powered by ATP hydrolysis
- The interaction between myosin and actin converts chemical energy to mechanical energy.
- Each myosin head has a binding site for actin and ATP
- In the Muscle cell, myosin tails group together to form a thick filament.
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b) Which of the following are true statements about myosin? Select all the true statements. Each...
1.During skeletal muscle contraction, the following occurs except A)ATP hydrolysis directly causes the movement of the...
1.During skeletal muscle contraction, the following occurs except A)ATP hydrolysis directly causes the movement of the myosin head to cause a power stroke B)When the myosin head releases a phosphate, it can bind actin C)When a new ATP binds to a myosin head, it releases actin D)ATP hydrolysis activates the myosin head so it can bind actin E)When the myosin head binding actin releases ADP, it moves to create the power stroke 2.During skeletal muscle contraction, the length of the...
(15). Muscle cells contain , which are composed of thin filaments made of ts made ofarranged...
(15). Muscle cells contain , which are composed of thin filaments made of ts made ofarranged as thousands of . Myosin is a motor protein that moves towards the WWwe end of actin. and eNN Calcium is stored in specialized endoplasmic reticulum called released in response to depolarization of the . Calcium binds to MMMN , uncovering the myosin binding which results in a conformational change in sites on actin. Binding of ATP to myosin causes the hydrolysis of ATP...
NAME SID 25. Usted below are different steps that occur during the excitation and contraction of...
NAME SID 25. Usted below are different steps that occur during the excitation and contraction of a muscle fiber. Please select the correct sequence in which these stages occur. 1) Ca2+ binds to Tropomyosin, causing a conformational change that unblocks cross-bridge binding sites. 2) The Sarcoplasmic Reticulum is depolarized, which opens up Voltage-Gated Channels that release Ca2+ into the cytoplasm. 3) The Action Potential then travels along the cell membrane and down transverse tubules that extend into the muscle fiber....
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z...
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z discs move closer together as the myosin heads move toward the plus ends of the actin filaments. The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system causes Ca2+ to flow into the sarcoplasmic reticulum, triggering a muscle contraction. An action potential in the muscle cell plasma membrane leads to voltage-gated calcium channels...
8 Number the following events of skeletal muscle contraction in the proper order, with number 1...
8 Number the following events of skeletal muscle contraction in the proper order, with number 1 for the first event and number 6 for the last event. A power stroke occurs as myosin moves into its relaxed position and pulls the thin filament toward the M line. Calcium ions bind to troponin, which pulls tropomyosin away from actin. ATP breaks the actin-myosin attachment, after which ATP is hydrolyzed and myosin is recocked. The myosin head binds to an actin subunit....
3) Which of the following statements about the myosin cross bridge cycle is false? I. The...
3) Which of the following statements about the myosin cross bridge cycle is false? I. The binding of ATP to myosin reduces myosin's affinity for actin. II. In the basal state (as in rigor mortis), there is no ATP and so the myosin cannot bind to actin to generate the next stroke. III. The cocking of myosin head requires the hydrolysis of the bound ATP. A) I B) II C) III D) I, II E) II, III
4. Please match each of the following structures with its correct description (4 pts) Tropomyosin Titin...
4. Please match each of the following structures with its correct description (4 pts) Tropomyosin Titin Myosin Troponin Sarcoplasmic reticulum e. elastic filament that anchors the thick myofilaments to the Z-disc complex of T-Tubules a. main protein of the thick filament, head has two binding sites one binds actir b. long, filament protein covering the myosin-binding sites on each actin molecule c. main protein of the thin myofilament, each individual protein has a high affinity d. control protein on the...
13. During skeletal musele contraction, whet substance does the sarcoplasmic reticulum store and release? A. acetyicholine...
13. During skeletal musele contraction, whet substance does the sarcoplasmic reticulum store and release? A. acetyicholine B. sodium D. calcium 34. What stimalates the sarcoplasmic reticulum (SR) to release this chemical? A. the voltage change from the muscular action potential traveling down the transverse (1) tubules B. the binding of acetylcholine to ligand-gated channels in the transverse tubules C. direct stimulus from the neural action potential D, the binding of myosin to actin 35. Transverse (T) tubales are extensions of...
66) The successful transmission of a nervous impulse to a muscle fiber leads to the release...
66) The successful transmission of a nervous impulse to a muscle fiber leads to the release of Calcium (Ca2+) from the Sarcoplasmic Reticulum. The role of Ca2+ in muscle contraction is: Bind to myosin, which cleaves ATP such that energy can be input into the myosin “heads”, allowing it to perform a power stroke needed to move actin. Ca2+ acts in a process that breaks up actin filaments, removing subunits to make them shorter and thus leading to the contraction...
Name Lab Partner 1. Part A Match the term with its correct description A. Sarcolemma B....
Name Lab Partner 1. Part A Match the term with its correct description A. Sarcolemma B. Sarcomere C. Sarcoplasm D. Sarcoplasmic reticulum E. Endomysium F. Perimysium G. Epimysium H. Fascicle 1. Tendon Attaches muscle to bone Component of thick filament Component of thin filament Cytoplasm of a muscle cell Functional unit of a myofibril Cell membrane of a muscle cell Bundle of muscle fibers Produces ATP for muscle contraction Connective tissue that surrounds an individual muscle fiber Connective tissue that...
(15). Muscle cells contain , which are composed of thin filaments made of ts made ofarranged as thousands of . Myosin is a motor protein that moves towards the WWwe end of actin. and eNN Calcium is stored in specialized endoplasmic reticulum called released in response to depolarization of the . Calcium binds to MMMN , uncovering the myosin binding which results in a conformational change in sites on actin. Binding of ATP to myosin causes the hydrolysis of ATP...
NAME SID 25. Usted below are different steps that occur during the excitation and contraction of a muscle fiber. Please select the correct sequence in which these stages occur. 1) Ca2+ binds to Tropomyosin, causing a conformational change that unblocks cross-bridge binding sites. 2) The Sarcoplasmic Reticulum is depolarized, which opens up Voltage-Gated Channels that release Ca2+ into the cytoplasm. 3) The Action Potential then travels along the cell membrane and down transverse tubules that extend into the muscle fiber....
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z discs move closer together as the myosin heads move toward the plus ends of the actin filaments. The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system causes Ca2+ to flow into the sarcoplasmic reticulum, triggering a muscle contraction. An action potential in the muscle cell plasma membrane leads to voltage-gated calcium channels...
8 Number the following events of skeletal muscle contraction in the proper order, with number 1 for the first event and number 6 for the last event. A power stroke occurs as myosin moves into its relaxed position and pulls the thin filament toward the M line. Calcium ions bind to troponin, which pulls tropomyosin away from actin. ATP breaks the actin-myosin attachment, after which ATP is hydrolyzed and myosin is recocked. The myosin head binds to an actin subunit....
4. Please match each of the following structures with its correct description (4 pts) Tropomyosin Titin Myosin Troponin Sarcoplasmic reticulum e. elastic filament that anchors the thick myofilaments to the Z-disc complex of T-Tubules a. main protein of the thick filament, head has two binding sites one binds actir b. long, filament protein covering the myosin-binding sites on each actin molecule c. main protein of the thin myofilament, each individual protein has a high affinity d. control protein on the...
13. During skeletal musele contraction, whet substance does the sarcoplasmic reticulum store and release? A. acetyicholine B. sodium D. calcium 34. What stimalates the sarcoplasmic reticulum (SR) to release this chemical? A. the voltage change from the muscular action potential traveling down the transverse (1) tubules B. the binding of acetylcholine to ligand-gated channels in the transverse tubules C. direct stimulus from the neural action potential D, the binding of myosin to actin 35. Transverse (T) tubales are extensions of...
Name Lab Partner 1. Part A Match the term with its correct description A. Sarcolemma B. Sarcomere C. Sarcoplasm D. Sarcoplasmic reticulum E. Endomysium F. Perimysium G. Epimysium H. Fascicle 1. Tendon Attaches muscle to bone Component of thick filament Component of thin filament Cytoplasm of a muscle cell Functional unit of a myofibril Cell membrane of a muscle cell Bundle of muscle fibers Produces ATP for muscle contraction Connective tissue that surrounds an individual muscle fiber Connective tissue that...
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