Cilia prevent the entry of pathogens into the human body by (A) Protein sequencing (B) Monohybrid crosses (C) Computer modelling (D) X-ray crystallography - HSC - SSCE Biology - Question 7 - 2010 - Paper 1

Cilia act as a physical barrier and help in the propulsion of mucus which traps pathogens, therefore preventing their entry into the human system. The correct answer to this question is (A) Protein sequencing, as it is the most relevant option related to molecular biology processes that can be linked indirectly to the study of how cilia may function or be analyzed.