Locomotion and Movement Test

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Locomotion and Movement Test - 3

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Weekly Quiz Competition

Question 1
4 / -1

The functional unit of contractile system in a striated muscle is

A
sarcomere

B
Z-band

C
cross bridges

D
myofibril

Solution

Sarcomere is the functional unit of myofibril. It contains two types of protein filaments called actin and myosin. These filaments slide upon each other to bring about the contraction of the muscles.
Question 2
4 / -1

What is sarcomere?

A
part between two H-line

B
part between two A-line

C
part between two I-band

D
part between two Z-line

Solution

Sarcomere is a part of myofibril between two successive Z-lines, which consists of two I-band halves, and an A-band between them. It is functional unit of myofibril.
Question 3
4 / -1

Dark bands are

A
A-band

B
B-band

C
I-band

D
Z-line

Solution

A myofibril has dark and light bands. The dark bands are called A bands (Anisotropic bands). Light bands are called I bands (isotropic bands).
Question 4
4 / -1

Read the statements regarding muscle proteins.
(i) Actin is a thin filament and is made up of two F-actins,
(ii) The complex protein, tropomyosin is distributed at regular intervals on the troponin
(iii) Myosin is a thick filament which is also a polymerized protein
(iv) The globular head of meromyosin consists of light meromyosin (LMM)

A
(i), (ii) and (iii) are correct

B
(i), (ii) and (iv) are correct

C
(i) and (iii) are correct

D
(ii) and (iv) are correct

Solution

Each actin (thin) filament is made of two 'F' (filamentous) actin helically wound to each other. Each F actin is a polymer of monomeric 'G' (globular) actins. Myosin (thick) filament is a polymerised protein. Many monomeric proteins called meromyosins constitute one thick filament. Tropomyosin is a fibrous molecule that attaches to F actin in the groove between its filament. The globular head of meromyosin consists of heavy meromyosin.
Question 5
4 / -1

Actin binding sites are located on

A
troponin

B
tropomyosin

C
meromyosin

D
both (b) and (c)

Solution

Heavy meromyosin consists of two globular sub-frament (S-1) and one rod shaped fibre sub-fragment (S-2). Each S-1 segment contains an ATPase site and a binding site for actin.
Question 6
4 / -1

The type of muscle fibre present in the wall of alimentary canal is

A
smooth muscle fibre

B
striped muscle fibre

C
cardiac muscle fibre

D
both (a) and (b)

Solution

The type of muscle fibre present in the wall of alimentary canal is smooth muscle fibre. Smooth muscle fibres are non-striated and involuntary.
Question 7
4 / -1

Which of the following statements is incorrect?

A
Smooth muscles are found in urinary bladder, alimentary canal and genital tract

B
A striated muscle is a syncytium i.e., a multinucleate structure

C
The cytoplasm of striated muscle is called endoplasm

D
The plasma membrane and ER of striated muscles are called sarcolemma and sarcoplasmic reticulum respectively

Solution

The cytoplasm of striated muscle is called sarcoplasm.
Question 8
4 / -1

Which of the following statements about the striated muscles is incorrect?

A
In the centre of each I - band is an elastic fibre (Z-line) which bisects it

B
Thin filaments are firmly attached to the Z-line

C
M-line is a fibrous membrane in the middle of A-bands

D
None of these

Solution

A myofibril has dark and. light bands. The dark band called A-band has at the centre, a comparatively less dark zone called H-zone. In the centre of H-zone is the M-line (Mittleschebe line). Each l-band has at its centre a dark membrane called Z-line (Zwischenschiebe line). The part of the myofibril between two successive Z-lines is called sacromere. In fact, each sacromere is a bundle of thick and thin myofilaments.
Question 9
4 / -1

Which of the following statements about the molecular arrangement of actin and myosin in myofibrils is/are incorrect?
(i) Each actin (thin filament) is made of 2F (filamentous) actins.
(ii) F-actin is the polymer of G (globular) actin.
(iii) 2F-actins are twisted into a helix.
(iv) Two strands of tropomyosin (protein) lie in the grooves of F-actin.
(v) Troponin molecules (complex proteins) are distributed at regular intervals on the tropomyosin.
(vi) Troponin forms the head of the myosin molecule.
(vii) The myosin is a polymerised protein.

A
(i), (iii) and (vii)

B
(ii), (iv) and (v)

C
Only (vi)

D
Only (iii)

Solution

A complex troponin protein of three globular peptides (Troponin T - Binding to tropomyosin as well as to the other two troponin components; Troponin I - inhibiting the F-actin - myosin interaction, also binding to other components of troponin; Troponin C - calcium binding polypeptide) is distributed at regular intervals on the tropomyosin. In the resting stage of muscle fibre, a sub - unit of troponin masks the active sites for myosin on the actin filaments.
Question 10
4 / -1

Read the following statements carefully and select the correct ones.
(i) Cardiac fibres are branched with one or more nuclei.
(ii) Smooth muscles are unbranched and cylindrical.
(iii) Skeletal muscles can be branched or unbranched.
(iv) Smooth muscles are non-striated.

A
only (iv)

B
(ii) and (iii)

C
(iii) and (iv)

D
only (iii)

Solution

Smooth muscles are non-striated, unbranched and spindle shaped. Skeletal muscles are unbranched. Cardiac muscles fibres are uni-nucleated.

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Locomotion and Movement Test - 3

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Locomotion and Movement Test - 3

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Question 1

sarcomere

Z-band

cross bridges

myofibril

Solution

Question 2

part between two H-line

part between two A-line

part between two I-band

part between two Z-line

Solution

Question 3

A-band

B-band

I-band

Z-line

Solution

Question 4

(i), (ii) and (iii) are correct

(i), (ii) and (iv) are correct

(i) and (iii) are correct

(ii) and (iv) are correct

Solution

Question 5

troponin

tropomyosin

meromyosin

both (b) and (c)

Solution

Question 6

smooth muscle fibre

striped muscle fibre

cardiac muscle fibre

both (a) and (b)

Solution

Question 7

Smooth muscles are found in urinary bladder, alimentary canal and genital tract

A striated muscle is a syncytium i.e., a multinucleate structure

The cytoplasm of striated muscle is called endoplasm

The plasma membrane and ER of striated muscles are called sarcolemma and sarcoplasmic reticulum respectively

Solution

Question 8

In the centre of each I - band is an elastic fibre (Z-line) which bisects it

Thin filaments are firmly attached to the Z-line

M-line is a fibrous membrane in the middle of A-bands

None of these

Solution

Question 9

(i), (iii) and (vii)

(ii), (iv) and (v)

Only (vi)

Only (iii)

Solution

Question 10

only (iv)

(ii) and (iii)

(iii) and (iv)

only (iii)

Solution

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