Which of the Following Nutrients Is the Most Essential for Life

question 34

Multiple Choice

Which of the following nutrients is the most essential for life?

• A)water
• B)protein
• C)calcium
• D)vitamin C

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Definitions:

Basal Body

Structure involved in the organization and anchorage of a cilium or flagellum. Structurally similar to a centriole; each is in the form of a cylinder composed of nine triplets of microtubules (9 × 3 structure).

Flagellum

A long, whiplike structure extending from certain cells and used in locomotion. (1) Eukaryote flagella consist of two central, single microtubules surrounded by nine double microtubules (9 + 2 structure), all covered by a plasma membrane. (2) Bacterial flagella are filaments rotated by special structures located in the plasma membrane and cell wall. (3) Archaea have a rotating appendage, an archaellum, for motility.

Micrometer

A precision measuring instrument capable of measuring dimensions to a very small fraction of a millimeter or inch.

Primary Cilium

Single nonmotile cilium on the cell surface of animal cells, especially those of vertebrates; binds specific molecules and serves as a “cellular antenna” in many signaling pathways.