The nucleus , which is essential for function and survival of the cell. A) is the site of protein synthesis B) contains the genetic code C) transforms cellular energy D) initiates aerobic metabolism 2. Although energy is not made in mitochondria, they are known as the powerplants of the cell because they: A) contain RNA for protein synthesis. B) utilize glycolysis for oxidative energy. C) extract energy from organic compounds. D) store calcium bonds for muscle contractions. 3. Although the basic structure of the cell plasma membrane is formed by a lipidbilayer, most of the specific membrane functions are carried out by: A) bound and transmembrane proteins. B) complex, long carbohydrate chains. C) surface antigens and hormone receptors. D) a gating system of selective ion channels. 4. To effectively relay signals, cell-to-cell communication utilizes chemical messenger systems that:
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