Collagen molecules are made up of three polypeptide chains interacting together. The individual polypeptide chains consist of a regular pattern of amino acids. Almost every third amino acid is glycine. Which protein structures of collagen are described?

primary and secondary

primary and quaternary

secondary and tertiary

tertiary and quaternary

Biology

IGCSE&ALevel

CAIE

Exam No：9700_s24_qp_11 Year：2024 Question No：8

Answer:

5.1.1.1 DNA

5.1.1.2 histone proteins

5.1.1.3 sister chromatids

5.1.1.4 centromere

5.1.1.5 telomeres

5.1.2.1 growth of multicellular organisms

5.1.2.2 replacement of damaged or dead cells

5.1.2.3 repair of tissues by cell replacement

5.1.2.4 asexual reproduction

5.1.3.1 interphase (growth in G1 and G2 phases and DNA replication in S phase)

5.1.3.2 mitosis

5.1.3.3 cytokinesis

5.1.4 outline the role of telomeres in preventing the loss of genes from the ends of chromosomes during DNA replication

5.1.5 outline the role of stem cells in cell replacement and tissue repair by mitosis

5.1.6 explain how uncontrolled cell division can result in the formation of a tumour