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Which are principal parts of a eukaryotic cell?
Organelles
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Which particle can penetrate cell membranes most easily?
Lipid soluble, transport protein present
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Which is inconsistent with the others?
Phaogocytosis
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Which can transport substances uphill against the concentration gradient?
active transport
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For a cell to engage in active transport processes, it requires:
- All of the above are correct
- - mitochondria, appropriate fuel, ATP, enzymes
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Caveolae:
- All of the above are correct
- -serve as repositories for some receptors, provide a route for transport into the cell, relay signals into cells
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Which statement is true for cytoplasm?
- A,B and C
- It is located outside the nucleus, it provides support for organelles, it is mostly water
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The retinoblastoma (Rb) Protein:
- A, B and C are correct
- is a brake on the progress of the cell cycle, binds to gene regulatory proteins, slows cell proliferation
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A major function of connective tissue is:
support and binding
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Signaling molecules cause all of the following except:
conversion of an intracellular signal into an extracellular response
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Increased cytoplasmic calcium:
decreases permeability at the junctional complex
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Cell junctions:
- Both A and C are correct
- coordinate activities of cells within tissues, hold cells together
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Identify the correct sequence of events for initiation and conduction of a nerve impulse
1. Sodium moves inside
2. potassium leaves cell
3. sodium permeability changes
4. resting potential is reestablished
5. Potassium permeability changes
3,1,5,2,4
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