Name the class in which : (a) digits end up in nail and claws ; (b) hair are present as exoskeleton.
(a) Mammals; (b) Mammals.
Name two classes of chordates in which clawed digits are present.
Enzyme collagenase breaks the peptide bonds present in collagen protein. Excessive secretion of this enzyme will lead to weakening of which of the following body parts?
(i) Tendons (ii) Bones (iii) Hair shafts (iv) Nails and claws (v) Intervertebral disc