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11.

How much lactic acid formed is resynthesized into glycogen:

A.	1/2 part	B.	3/4 part
C.	4/5 part	D.	1/4 part

12.

How much lactic acid formed is broken by oxidation to form CO2 and water:

A.	1/2 part	B.	2/3 part
C.	3/4 part	D.	1/5 part

13.

Spur-like structures are found in the molecule of:

A.	Action	B.	Myosin
C.	Both (a) & (b)	D.	None of these

14.

Which of these proteins are attached with actin of myofibril:

A.	Trponin	B.	Tropomyosin
C.	Both (a) & (b)	D.	None of these

15.

The 'A' band in myofibril occupies:

A.	2/3rd of length of sarcomere so that muscle shortens by 1/3rd of its length during contraction	B.	1/3rd of length of sarcomere so that muscle shortens by 2/3rd of its length during contraction
C.	1/2 of length of sarcomere so that the muscle shortens 1/2 of it	D.	3/4th of the length of sarcomere so that the muscle shortens by 1/4th of its length during contraction

16.

Actin has a strong affinity to myosin and readily combines with it to form actomyosin but this is inhibited by:

A.	Troponin through its Tpc subunit	B.	Troponin through its Tpt subunit
C.	Troponin through its Tpi subunit	D.	None of these but by tropomyosin

17.

Troponin subunit Tpc inhibits actomyosin formation by:

A.	Binding with myosin	B.	Binding with Ca++ ions
C.	Binding with trpomyosin	D.	None of these mthods

18.

Which of these structures over myosin help in contraction of the muscle fibre:

A.	Cross bridges over spur	B.	Tropomyosin protein
C.	Both (a) & (b)	D.	None of these

19.

During muscle contraction:

A.	Actomyosin contracts so that cross bridges tilt dragging filaments of actin towards 'M' line	B.	Only myosin contracts pulling actin filaments towards 'M' line
C.	Both of these processes occur simultaneously	D.	None of these processes occur

20.

Cross bridges are found on:

A.	Actin	B.	Myosin
C.	Troponin	D.	Tropomyosin