Which one of the following items gives its correct total number?

1.  Floating ribs in humans           - 4 

2.  Amino acids found in proteins  -16

3.  Types of diabetes                   - 3

4.  Cervical vertebrae in humans  - 8

Given diagram shows bone of the left human hindlimb as seen from front. It has certain mistakes in labeling. Two of the wrongly labelled bones are

(1) tibia and tarsals 

(2) femur and fibula

(3) fibula and phalanges

(4) tarsals and femur 

Which of the following is correct about the given figure?

(1) The length of the thick and thin myofilaments has changed.

(2) Length of both anisotropic and isotropic band has changed.

(3) The myosin cross-bridges move on the surface of actin and the thin and thick myofilaments slide past each other.

(4) Length of the sacromere remains same.

Skeletal muscles appear striated due to the presence of two characteristic proteins in alternating dark and light bands. Which of the following is a correct match of the protein with its light refractive property and color?

       Protein                  Colour                 Property

(1)  Myosin                   Light                 Anisotropic

(2)  Actin                      Dark                 Anisotropic

(3)  Myosin                   Dark                  Isotropic

(4)  Actin                      Light                  Isotropic

During muscular contraction, which of the following events occur?

(i)   H-zone disappears

(ii)  A band widens

(iii)  I band shortens

(iv)  Width of A band is unaffected

(v)  M line and Z line come closer

(1)  (i),(iii),(iv) and (v)

(2)  (i),(ii) and (v)

(3)  (ii),(iv) and (v)

(4)  (i),(ii) and (iii).

The H-Zone in the skeletal muscle fibre is due to 

(1) the central gap between actin filaments extending through myosin filaments in the A-band

(2) extension of myosin filaments in the central portion of the A-band

(3) the absence of myofibrils in the central portion of A-band

(4) the central gap between myosin filaments in the A-band

Consider the diagram given below.

Parts labelled as A, B, C, D, E and F respectively indicate.

(1) Sacrum, ilium, pubis, femur, tibia and fibula

(2) Ilium, pubis, sacrum, femur, fibula and tibia

(3) Sacrum, pubis, ilium, femur, tibia and fibula

(4) Ilium, sacrum, pubis, femur, tibia and fibula

Pick out the correct match

(1) Sternum       - 14

(2) Pelvis           - 3

(3) Ribs             - 20

(4) Face            - 5

Match Column-I with Column-II:

(1) A - I, B - II, C - III, D - IV

(2) A - I, B - III, C - II, D - IV

(3) A - I, B - IV, C - III, D - II

(4) A - III, B - IV, C - II, D - I

Light bands (thin filaments) contain actin and are called:

(1) A-bands or Isotropic band            

(2) A-bands or Anisotropic bands

(3) I-bands or Isotropic bands           

(4) I-bands or Anisotropic bands