NSG 5003-week 1 exam review- with verified questions and

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. It is true that a eukaryotic cell: Week 1 review questions THE CELL Eukaryotic cells contain organelles and histones, they have a well­defined nucleus, and are larger than pro... karyotic cells. The histones are binding proteins that cause the supercoiling of DNA into chromosomes and do not affect cellular division, movement, or activities. 3. An organelle that is responsible for the metabolism of cellular energy is referred to as a/an: Mitochondria play a role in cellular metabolism, cellular respiration, and energy production. The Golgi complex is responsible for processing and packaging proteins from the endoplasmic reticulum, where they are synthesized. The nucleolus is a small, dense structure that contains the ribonucleic acid (RNA), DNA, and DNA­binding proteins. 4. Which statement best describes a desmosome? The desmosome is a type of cell junction. The other two types include tight junctions and gap junctions. Desmosomes hold cells together by forming a continuous band of epithelial tissue or belt (or button like) points of contact. They are also a source of structural stability. Tight junctions serve as barriers to diffusion and prevent the movement of substances through transport proteins. Gap junctions are clusters of communicating tunnels. 5. Which statement describes the function of a second messenger? The binding of a ligand to a cell surface receptor triggers the activation of intracellular second messengers. Second messengers activate signal transduction pathways in the cell that can initiate different intracellular events. Cyclic adenosine monophosphate CONTINUED....... [Show More]

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