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Name the Structure with Arrow Points

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1. Name the structure to which the arrow points.
2. Give an example of a specific organism which has the structure.
3. Briefly describe at least one function the structure performs (what it helps the organism do).

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1. Arrow indication denotes flagellum of that organism


Euglena is a genus of microscopic, one-celled organisms in the Protista kingdom. There are about 150 species of euglenas. They live in fresh water, and are especially common in warm seasons when they may form a green scum on the surfaces of small ponds or drainage ditches.

Euglenas use a flagellum (a whiplike appendage) that sticks out from the body, to move and are thus categorized as flagellates.

Characteristic features of flagella:

 flagella move liquid past the surface of the cell
 Swimming is the major form of movement exhibited by sperm and by many protozoans

Flagella consist of:

• a cylindrical array of 9 filaments consisting of:
o a complete microtubule extending into the tip of the cilium;
o a partial microtubule that doesn't extend as far into the tip.
o cross-bridges of the motor protein dynein that extend from the complete microtubule of one filament to the partial microtubule of the adjacent filament.
• a pair of single microtubules running up through the center of the bundle, producing the "9+2" arrangement.
• The entire assembly is sheathed in a membrane that is an extension of the plasma membrane.

2. Arrow indication denotes pseudopodium of that organism


Amebas use mobile extensions of the cytoplasm called pseudopodia for movement and food capture. Protozoans that form pseudopodia have two type of cytoplasm, an outer, more viscous portion called the ectoplasm and an inner, more fluid portion called the endoplasm. When a pseudopodium begins to form, a clear space at the leading edge of the pseudopodium called the hyaline cap appears. After ...

Solution Summary

The expert names the structures with arrow points. At least one function that structure performs that helps the organism is discussed.

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