(a)[2]
Fig. 4.1 is a transmission electron micrograph showing a chondrocyte. Using Fig. 4.1 as a reference, explain two visible features of the chondrocyte that indicate how it is adapted to its function.
(b(i))[2]
Describe the way cartilage is distributed in the human gas exchange system.
(b(ii))[2]
Outline the role of cartilage in the human gas exchange system.
(c(i))[1]
Fig. 4.2 displays part of the primary structure of a collagen polypeptide. Name the covalent bond type that joins the amino acids shown in Fig. 4.2.
(c(ii))[3]
Fig. 4.3 shows the molecular structure of the amino acid glycine (gly). With reference to Fig. 4.2 and Fig. 4.3, and to the function of collagen, explain how the structure of a collagen polypeptide makes it suitable for forming a collagen molecule.