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MCAT Question A Day - 7/25/13 - Answer!

Which of the following structures do not play a role in the movement of cells or the movement of materials past cells?

A.  Centrioles
B.  Flagella
C.  Cilia
D.  Microtubules and microfilaments

The correct answer is (A). Centrioles are associated with the spindle fibers that help move chromatids to opposite poles within the cell during the anaphase and telophase stages of mitosis and meiosis. Flagella and cilia can propel individual cells (sperm cells and paramecium, respectively), ciliated cells can move materials along (ciliated mucous membranes), and microtubules and microfilaments form the cytoskeleton of cells. The rearrangement of this cytoskeleton plays a role in the changes in shape and movement of cells like the amoeba and phagocytotic white blood cells.