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The myosin myofilament can be cleaved in...

The myosin myofilament can be cleaved into a head and a tail piece. All of the following are accurate in describing the position of myosin in a sacromere except
(i) A-band is the length of a myosin myoilaments
(ii) A-band contains thin and thick myofilaments
(iii) A-band does not include actin-binding sites

A

I and II only

B

II and III only

C

III only

D

I, II and III

Text Solution

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The correct Answer is:
C
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Read the given Statements for skeletal muscles (i) Thin filaments are firmly attached to the Z - line . (ii) The light band is also called the I - band and contains mostly actin. (iii) A sarcomere is the functional unit of a myofibril between two adjacent A - bands . (iv) The central part of the thick filament , not overlapped by the thin filament is called the H - zone Which of these is/are CORRECT ?

The given graph shows length-tension curve for a typical vertebrate sarcomere. By analysing the graph, what can you deduce regarding the muscle contraction? (i) Neither the myosin filaments nor the actin thin filaments change in length when a sarcomere shortens or is stretched. Instead, it is the extent of ocerlap between actin and myosin filaments that changes. (ii) The total tension produced by a sarcomere is proportional to the total number of cross-bridges that can interact with actin filaments, and this number in turn is proportional to the amount of of overlap between thick and thin filaments. (iii) The tension produced by the muscle is maximal when the overlap between thick and thin filamentss allows the largest number of myosin cross-bridges to bind to actin. (iv) Tension drops off with increased lenght, because the thick and thin filaments overlap less and fewer cross-bridges can bind. Tension drops off with decreased length, because thin filaments at the two ends of the secromere begin to collide with each other, preventing further shortening.

Statements A-bands of the muscle are dark and contain myosin I-band are the light bands and contain actin During muscle contraction the A-band contracts The part between the two Z-lines is called as sarcomere The central part of thin filament, not over-lapped by thick filament is called H-zone of the above statements.

Statements: 1. A bands are dark and contain myosin. I-bands are light and contain actin. 3. During action, A band contracts. 4. Part between two Z-lines is sarcomere. 5. Central part of thin filaments, not overlapped by thick filaments is H-zone.

Statements : 1. A bands are dark and contain myosin 2. I-bands are light and contain actin 3. During action, A band contracts 4. Part between two Z-lines is sarcomere 5. Central part of thin filament, not overlapped by thick filaments is H-zone.

Read the following statements and select the correct option : I. In the skeletal muscles fibre, large number of myofilaments are arranged in the sarcoplasmic . II. The central part of an anisotropic band where the only thick , filament is present and thin filament is absent is called 'A' band. III. In the resting state , a tropomyosin protein masks the active b binding sites for myosin on the active filaments . IV. The junction between a motor neuron and the sarcolemma of the muscle fibres is called motor-end plate.

Consider the diagram of thin myofilament. Now, read carefully the statements about molecular arrangement of actin and myosin in the filament. I. Each actin (thin filament ) is made up of 2 F-(filamentous) actins. II. F-actin is the polymer of G-(globular) actin. III. Two-F-actins are twisted into a helix. IV. Two strands of tropomyosin run along the entire length of F-actin. Choose the correct option.

Select the total number of false statement from the following (i) The globular head is an active ATPase enzyme and has binding sites for ATP and active sites for Myosin. (ii) Each Myosin (think) filament is also a polymerized protine. (iii) Many monomeric proteins celled Meromyosins canstitute one thick filament. (iv) Each meromyosin has two important parts, a globular head with a short arm and a til, the former being Called the heavy meromyosin (HMA) and the latter, the light meromysin (LMN). (v) The HMM component, i.e., the head and short arm projects outwards at regular distance and angle from each other from the surface of a polymerized myosis filament and is known as cross arm

Consider the following statements each with one or two blanks. (i)Repeated activation of the muscles can lead to the accumulation of (1) to anaerobic breakdown of glycogen in them, causing fatigue. (ii)The globular head of meromyosin is an active ATPase enzyme and has binding sites for(2) and active sites for(3) (iii)This central part of thick filament, not overlapping by thin filaments is called the(4)

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