Entry Test MCQ :: Support and Movement

@ : Home > Biology > Support and Movement

51.

The most important function of troponin is

A.	To bind with actin	B.	To bind with tropomyosin.
C.	To bind with Ca2+ ions.	D.	All of these

52.

If a cross section of a sarcomere is seen, each myosin is surrounded by how many actin molecules:

A.	9	B.	5
C.	6	D.	7

53.

What happens during muscle contraction to the length of each myosin and action filament?

A.	Z- lines get closer	B.	A band becomes short
C.	1 band elongates	D.	There is no change in sarcomere

54.

Which of the following step occurs immediately after binding of Ca2+ with troponin molecule during muscle contraction.

A.	Binding sites of actin get attached to the myosin head.	B.	Troponin uncovers the actin binding sites.
C.	Tropomyosin gets removed from the binding sites of actin filaments.	D.	Ca2+ goes back inside sarcoplasmic reticulum.

55.

Rigor mortis i.e, stiffening of body after death results from:

A.	Accunulation of rigid proteins molecules in sarcoplam.	B.	Unavailability of ATP, which is necessary to break the link between actin and myosin.
C.	Decrease in body temperature after death.	D.	Death of tissue due to unavailability of O2.

56.

Which of the following statement about fatigue is correct?

A.	The major event in it is accumulation of lactic acid.	B.	Lactic acid accumulation turns pH in acidic range leading to muscle ache.
C.	Ionic imbalance may also cause it.	D.	All of these

57.

Tetany is caused by

A.	Hypocalcemia	B.	Hypercalcemia
C.	Clostridum tetani.	D.	Low O2 level

58.

Which one of the following is an example of a non-elastic connective tissue?

A.	Ligaments.	B.	Tendon
C.	Muscles.	D.	None of these

59.

Which of the following muscle is an antagonistic member of Biceps brachii?

A.	Bracheoradialis	B.	Brachialis.
C.	Intercostals	D.	Triceps

60.

Insertion of Biceps is on

A.	Ulna	B.	Radius
C.	Olecronon process of ulna.	D.	Scapula