Bio 1 lab midterm.docx - 1 Compare and contract Prokaryotic...

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1. Compare and contract Prokaryotic and Eukaryotic cells. List all organelles that are found in both and the organelles specific to each cell type. Give the functions of each organelle listed. Organisms of the domains Bacteria and Archaea consist of prokaryotic cells. Protists, fungi, animals, and plants all consist of eukaryotic cells. In a prokaryotic cell it’s characterized by having no nucleus, DNA is concentrated in a region called the nucleoid, but no membrane separates this region from the rest of the cell. Cytoplasm bound by the plasma membrane. In contract, the eukaryotic cells are characterized by having true nucleus, bounded by a membranous nuclear envelope. Membrane-bound organelles, cytoplasm in the region between the plasma membrane and nucleus. In addition, eukaryotic cells are generally much larger than prokaryotic cells. Organelle that are found in both are: Ribosomes: nonmembranous organelles (small brown dots) that make proteins; free in cytoplasm or bound to rough ER or nuclear envelope. Cell wall: rigid structure outside the plasma membrane which maintains cell’s shape and protects cell from mechanical damage. Plasma membrane also known as the Cell membrane: is the outermost cell surface which separates the cell from the external environment Cytoplasm: a semiliquid substance that composes the foundation of a cell or interior of cell. 2. What is a buffer? How do buffers work in your body? Be specific Explain why a buffer cannot work continuously regardless of how much acid or base you add to it? Buffers are substances that minimize changes in the concentrations of H+ and OH- in a solution. Buffers normally maintain the PH of human blood very close to 7.4, which is slightly basic. A person cannot survive for more than a few minutes
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