Locomotion and Movement Test

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

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

Question 3
4 / -1

Dark bands are

A
A-band

B
B-band

C
I-band

D
Z-line

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

Question 5
4 / -1

Actin binding sites are located on

A
troponin

B
tropomyosin

C
meromyosin

D
both (b) and (c)

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)

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

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

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)

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)

Submit Test

Locomotion and ...

Question 1

sarcomere

Z-band

cross bridges

myofibril

Question 2

part between two H-line

part between two A-line

part between two I-band

part between two Z-line

Question 3

A-band

B-band

I-band

Z-line

Question 4

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

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

(i) and (iii) are correct

(ii) and (iv) are correct

Question 5

troponin

tropomyosin

meromyosin

both (b) and (c)

Question 6

smooth muscle fibre

striped muscle fibre

cardiac muscle fibre

both (a) and (b)

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

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

Question 9

(i), (iii) and (vii)

(ii), (iv) and (v)

Only (vi)

Only (iii)

Question 10

only (iv)

(ii) and (iii)

(iii) and (iv)

only (iii)

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