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Bild 1 week3 questions

Bild 1 week3 questions - 6 Why are lysosomes part of the...

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BILD 1, B10 Grace Lee 4/16/08 [email protected] Week 3, Quiz 2 1. What cell structures does a developing membrane protein pass through - starting as a strand of mRNA inside the nucleus and ending as a protein in the plasma cell membrane? 2. What are the structures found in animal cells and absent in plant cells? 3. What are some benefits of a multi-step, signal transduction pathway that involves a second messenger? 4. Cardiac muscle cells are connected by junctions that allow ions to flow between them, allowing a mixing the two cytoplasms. What type of junction is this an example of, and what is one reason for having this junction in heart muscle cells? 5. What is the difference between paracrine signaling and hormonal signaling? What is an advantage of each type of signaling?
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Unformatted text preview: 6. Why are lysosomes part of the endomembrane system (as in, why might it be important to enclose the contents of lysosomes in a membrane)? 7. Which element of the cytoskeleton is involved in cell motility by cilia or flagellae, along with chromosome movements in cell division? 8. Which element of the cytoskeleton is involved in muscle contraction and cleavage furrow formation during cell division? 9. What is the complementary strand of the following segment of DNA? (Please write the complementary strand 5’ 3’): 5’- A-G-T-C-A-A-T-G-C-3’ 10. What is the key difference between receptor tyrosine kinases and G-protein-linked receptors? Briefly describe the mechanisms of each....
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