BIO 122 Exam 1 Key

BIO 122 Exam 1 Key - Stanford and Kabnick Fall 2011 Name: _...

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Stanford and Kabnick Fall 2011 Name: _______________________ Bio 122 Cells and Genetics Fall 2011 Exam I Key 1. All living cells: A. Have nuclei B. Have cell walls C. Have mitochondria to generate energy D. Have ribosomes to make proteins E. All of the above D is correct. All living cells have ribosomes that are used to make proteins. Not all cells have cell walls (animal cells don’t). Not all cells have nuclei (prokaryotes don’t). Not all cells have mitochondria (prokaryotes don’t). 2. Lysomes can perform all of the following functions, except: A. Catalyze the rapid breakdown of macromolecules B. Synthesize some phospholipids C. Breakdown substances taken into the cell by phagocytosis D. Fuse with an endosome to allow the substances within to mix with the contents of the lysosome B is correct. The lysosome is responsible for breaking down molecules that are brought into it by fusing with endosomes/phagosomes that bring in substances taken into the cell by endocytosis/phagocytosis. As well, the lysosome can break down old organelles within the cell (not discussed here). 3. Which of the following has at least one lipid bilayer: A. Golgi Apparatus B. Ribosome C. Centrioles D. All of the above A is correct. The ribosome and centrioles do not have a lipid bilayer surrounding them. 4. One of the relationships that exists between the endoplasmic reticulum and the plasma membrane is that: A. Proteins intended to be secreted from the cell are synthesized in the endoplasmic reticulum, travel from there to the Golgi to the lysosome, and then out through the plasma membrane B. Proteins intended to be secreted from the cell are synthesized in the endoplasmic reticulum, travel through the secretory pathway and eventually get out of the cell by moving through a channel in the plasma membrane C. Integral, transmembrane proteins found in the plasma membrane were synthesized on ribosomes bound to the endoplasmic reticulum. These proteins were modified in the endoplasmic reticulum, then traveled through the rest of the secretory pathway to end up in the plasma membrane D. Integral, transmembrane proteins found in the plasma membrane are synthesized in the part of the endoplasmic reticulum that is smooth and tubular, and then they move through the secretory pathway to end up in the plasma membrane E. All of the above
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Stanford and Kabnick Fall 2011 C is correct. A is wrong because secreted proteins do not travel through the lysosome on their way to the plasma membrane. B is wrong because secreted proteins do not move through a channel to leave the cell – they leave via exocytosis. D is wrong because proteins are made in the rough ER, not the smooth ER. 5. Hutchinson-Gilford Progeria Syndrome is a very rare disease that is caused by several different mutations in a gene that encodes an intermediate filament subunit. Which of the following is true in people that have this disease, based on what you learned in class? A.
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BIO 122 Exam 1 Key - Stanford and Kabnick Fall 2011 Name: _...

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