← Back to Zoology

Locomotion and movement

155 Questions Start Allen Test
All Exams Allen
Q151 Allen ANALYTICAL QUESTIONS MCQ
Statement I : Each myofibril has alternate dark and light band on it. Statement II : Myosin filaments are thinner as compared to the actin filaments. In the light of the above statements, choose the correct answer from the option given below.
A.
Both statement-I and Il are incorrect.
B.
Statement-I is correct but statement-Il is incorrect.
C.
Statement-I is incorrect but statement-Il is correct.
D.
Both statement-I and II are correct.
Q152 Allen ANALYTICAL QUESTIONS MCQ
Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Increase Ca+² level leads to the binding of calcium with a subunit of troponin on actin filaments.
Reason (R) : Action potential spreads through the muscle fibre and causes the release of calcium ion into the sarcoplasm.
In the light of the above statements, choose the correct answer from the option given below.
A.
Both (A) and (R) are correct but (R) is not the correct explanation of (A).
B.
(A) is correct but (R) is not correct.
C.
(A) is not correct but (R) is correct.
D.
Both (A) and (R) are correct and (R) is the correct explanation of (A)
Q153 Allen ANALYTICAL QUESTIONS MCQ
The type of muscles present in our :
A.
upper arm are smooth muscle fibres fusiform in shape.
B.
heart are involuntary and unstriated smooth muscles.
C.
intestine are striated and involuntary.
D.
thigh are striated and voluntary
Q154 Allen ANALYTICAL QUESTIONS MCQ
Which one of the following pairs of chemical substances, is correctly categorised ?
A.
Troponin and myosin – Complex proteins in striated muscles
B.
Secretin and rhodopsin – Polypeptide hormones
C.
Calcitonin and thymosin – Thyroid hormones
D.
Pepsin and prolactin – Two digestive enzymes secreted in stomach
Q155 Allen ANALYTICAL QUESTIONS MCQ
The H-zone in the skeletal muscle fibre is due to:
A.
extension of myosin filaments in the central portion of the A-band
B.
the absence of myofibrils in the central portion of A-band
C.
the central gap between myosin filaments in the A-band
D.
the central gap between actin filaments extending through myosin filaments in the A-band