Describe the structure and function of cilia and flagella. Be sure to include the following in your answer : basal body, doublets, triplets, dynein, fused, unfused, and "9+2."
What will be an ideal response?
Flagella and cilia are motile extensions of a cell, and they contain nine fused pairs of microtubules (each pair is a doublet) arranged in a ring around two single unfused microtubules, yielding a "9+2" arrangement. Dynein motor molecules walk along adjacent microtubule doublets, causing the doublets to slide past each other; this is responsible for the bending and stroking actions of cilia and flagella. Cilia and flagella arise from basal bodies, which are similar to centrioles and have nine fused triplets rather than doublets of microtubules and do not surround any unfused microtubules.
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a) A b) B c) C d) F e) H
This figure shows an anterior view of the arm muscles. What muscle does number 1 indicate?
A. Biceps brachii B. Brachialis C. Coracobrachialis D. Brachioradialis E. Triceps brachii
What is the benefit of having some of the cellular organelles enclosed by a membrane similar to the cell (plasma) membrane?
What will be an ideal response?
If vitamins do not provide a source of energy, what is their role in nutrition?
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