Chapter 6.8, Problem 1CC

Summary Introduction

To explain: How cilia functions in Colpidium colpoda.

Concept introduction: Colpidium colpodais is a unicellular eukaryote found in fresh water including lakes, ponds and streams. C. colpodais used as an indicator for water quality. It survives on bacteria. It has cilia that help in bringing about a movement. Cilia are specialized arrangements of microtubules. Microtubules are hollow tubes of 25nm diameter. It is important for the maintenance of cell shape and motility. Microtubules are arranged in “9+2” pattern. There are two microtubules at the center and nine microtubule pairs at the periphery. At the periphery, microtubules are present in doublet. Cilia carry movement by alternative power and recovery strokes.