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1.

During skeletal muscle contraction, increase in calcium levels leads to binding of calcium to a subunit of _______ on ______ filaments and thereby removes the masking of active sites for ______.
1. Troponin, Tropomysin, Myosin
2. Calmodulin, Actin, Myosin
3. Troponin, Actin, Myosin
4. Calmodulin, Actin, Myosin

2.

Assertion (A):	Visceral muscles are called involuntary muscles.
Reason (R):	Visceral muscles are not under the voluntary control of the nervous system

 

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True, but (R) is not the correct explanation of (A).
3.	(A) is True, but (R) is False.
4.	(A) is False, but (R) is True.

3.

Which of the following is not true regarding M line?

4. A 55 year old female met with an accident that results in fracture due to her decreased bone mass. The most likely reason for decreased bone mass is 
1. Normal estrogen level in blood 
2. Low PTH in blood 
3. Low calcium in bones due to low estrogen 
4. Increased progesterone in blood 

5.

Which of the following is not a feature of cardiac muscles?

6.

Each meromyosin has two
1. globular head with a short arm
2. Important part- HMM and LMM
3. Tails and one head
4. Short arms and one tail

7.

Select the true statement 
1.  A band is present in the middle of the sarcomere
2.  H zone is present in the middle of A-band 
3.  M line is present in the middle of the H-zone
4.  All of these 

8.

A in dark band of muscle fibril stands for

9.

ATP is hydrolysed by:-
1. Myosin head
2. Myosin tail
3. Tropomyosin
4. Troponin

10. Consider the given two statements:

Statement I:	Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other.
Statement II:	Each ‘F’ actin is a polymer of monomeric ‘G’ (Globular) actins.

1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect

11. A collagenous connective tissue on the surface of muscles holding together the fasciles is known as:

1.	fascia	2.	perimysium
3.	endomysium	4.	sarcolemma

12.

Contractile fibrils of muscles are called:

1.	Neurofibrils	2.	Collagen fibres
3.	Myofibrils	4.	Yellow fibres

13.

Which of the following statements is not correct?

14.

Which of the following is correct statement ?

1.	Actin and regulatory proteins are located in thin filament.
2.	Z-lines anchor myosin (thick) filament to the ends of the sarcomere.
3.	Sarcoplasmic reticulum stores acetylcholine.
4.	Myosin cross bridges contain calcium binding sites.

15. The head of the myosin myofilament has sites for:

I:	binding to active sites on actin myofilaments
II:	binding to ADP

1. Only I
2. Only II
3. Both I and II
4. Neither I nor II

16. According to the sliding filament theory:

1.	Actin and myosin filaments slide over each other to increase the length of the sarcomere.
2.	Length of A–band does not change.
3.	I–band increases in length
4.	The actin filaments slide away from A–band resulting in shortening of sarcomere

17.

The head part of the HMM of muscle fiber is
1. Globular
2. Triangular
3. Filamentous
4. Both 2 and 3

18. Which part of the sarcomere contains only thick filaments and is not overlapped by thin filaments in the resting state?
1. Z line
2. A band
3. H zone
4. I band

19.

Which of the following movement is not associated with human body?

20.

How many G actins are there in a thin filament?

21.

Which of teh following cells in our body exhibit 
amoeboid movement?
(1) Fibroblast and thrombocytes
(2) Macrophages and thromocytes
(3) Macrophages and leucocytes
(4) Leucocytes and thrombocytes

22.

I:	Paramecium employs cilia for pushing food in cytopharynx and in locomotion
II:	Hydra takes the help of tentacles for both food capturing and locomotion
III:	All locomotions are movements and vice-versa
IV:	Methods of locomotion vary with habitats and the demands of the situation
V:	Ciliated epithelium is found in the respiratory tract, renal tubules, and reproductive tracts

Which of the above statements is false?
1. I and III
2. III
3. III and V
4. IV and V

23. Which list is in the correct order of DECREASING size?
1. muscle fibre, sarcomere, myofilament, myofibril
2. muscle, fasciculus, muscle fibre, myofibril
3. sarcomere, fasciculus, myofibril, myofilament
4. muscle, muscle fibre, myosin, myofibril

24.

Which of the following statements is wrong ?
1. Movement is one of the significant features of living beings 
2. Streaming of protoplasm in the unicellular organisms like Ameoba is a simple form of movement 
3. Animals and plants exhibit a wide range of movements 
4. Movement of cilia, flagella and tantacles is limited to lower organisms 

25. The protein complex responsible for the automatic resetting of myosin heads [breaking of cross-bridge] during muscle contraction involves ATP binding to:
1. Actin
2. Myosin
3. Tropomyosin
4. Troponin

26.

The part of the sarcomere that is composed of only myosin myofilaments is:

1.	A band	2.	I band
3.	M line	4.	H zone

27. Consider the statements given below and choose the option that correctly states them as True (T) or False (F). 

1.	Sphenoid and ethmoid are unpaired cranial bones
2.	Actin filaments are firmly attached to the Z-line
3.	The portion of myofibril between non-consecutive 'Z' lines is called sarcomere
4.	Muscles constitute more than 50% of the body weight in an adult human

 

	(a)	(b)	(c)	(d)
1.	T	T	T	T
2.	T	F	F	T
3.	T	T	F	F
4.	F	T	T	T

28.

The dark and light bands seen as striations in a skeletal muscle are located on:

1.	Myofilaments	2.	Muscle fiber
3.	Myofibril	4.	Motor unit

29. The sarcoplasmic reticulum releases calcium ions in response to:
1. Depolarization of the sarcolemma
2. Myosin binding to actin
3. ATP hydrolysis
4. Tropomyosin displacement

30. Which of the following statements are correct regarding skeletal muscle?

A:	Muscle bundles are held together by collagenous connective tissue layer called fascicle.
B:	Sarcoplasmic reticulum of muscle fibre is a store house of calcium ions.
C:	Striated appearance of skeletal muscle fibre is due to distribution pattern of actin and myosin proteins.
D:	M line is considered as functional unit of contraction called sarcomere.

Choose the most appropriate answer from the options given below:

1.	C and D only	2.	A, B and C only
3.	B and C only	4.	A, C and D only