Spectrum biology

BASED QUESTIONS

1. Consider the diagram given below and carefully
   read the statements with reference to it.

Statements

I.C is a thin filament and made up of two F-actins.

II.The complex protein, B is distributed at regular

intervals of troponin.

III.A is a thick filament which is not a polymerised

protein.

IV.The globular head of meromyosin consists of

Light Meromyosin (LMM).

Choose the option with correct set of statements.

(a) Only III (b) Only I

(c) I, II and III (d) II and IV

2. Carefully observe the diagram given below of
   pectoral girdle.

Consider the statements with reference to the

structure.

I.A is attached to scapula for articulation with

clavicle bone.

II.C facilitates articulation of femur.

III.A is formed from scapula bone.

IV.B provides surface to which tendons of muscles

attach.

Choose the correct code with incorrect set of

statements.

(a) I, II and III (b) I, II and IV

(c) III and IV (d) I, II, III and IV

3. Observe the figure of motor unit given below.

Identify the correct set of statements describing it,

from codes given below.

I.The motor unit consists of two motor, neuron

and muscle fibres.

II.Sarcolemma lying beneath the nerve endings

is called motor end plate.

III.Axon terminals and motor end plate together

constitute neuromotor junction.

IV.Motor unit transmit impulses to brain.

Codes

(a) I and IV (b) I, II and III

(c) II and III (d) I, II, III and IV

4. Carefully observe the diagram and identify the
   states of sarcomere in A, B and C.

Sanubia

A

B

C

A B

C

Spine

Skeletal

muscle fibres

Axon of

motor

Myelin nerve

sheath

Neuromuscular

junction

Nuclei of muscle fibres

H-zone I-band

Z-line Z-line

Two sarcomers

A-band

Z-line

A

B

C