apr01 - BIO250Y Spring Lecture questions (1-48): All...

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BIO250Y Spring Lecture questions (1-48): All questions of equal weight. Choose the best answer. There is one and ONLY ONE correct answer per question. ANSWERS: D,E,B,A,C,D,A,D,B,E,B,E,A,C,D,B,B,E,A,D,A,E,C,C,E,C,B,D,A,D,C,B,B,A,B,A, D,D,A,B,A,D,B,D,A,C,AorD,BorC,B,C,D,A,D,C,C,A,D,B,D,C,D,E,B,D,C,B,A,C 1. Which statement is CORRECT? a) Prokaryotic cells have cell walls but eukaryotic cells do not. b) Prokaryotic cells have a very small nucleus. c) Prokaryotic cells never have internal membranes. d) All prokaryotic and eukaryotic cells have a plasma membrane that controls which organic molecules and ions can enter the cell. e) Gram-positive bacteria have an inner membrane that functions as the plasma membrane and an outer membrane outside of the cell wall. 2. Which statement is CORRECT? a) The largest organelle in a typical cell of a multicellular plant is the nucleus. b) Plant cells differ from animal cells because they do not have mitochondria. c) Plant cells differ from animal cells because they do not have a cytoskeleton. d) Gap junctions and plasmodesmata have the same structure but are given different names in plant and animal cells. e) In eukaryotic cells, the endoplasmic reticulum is connected to the outer membrane of the nucleus. 3. Which statement is FALSE? a) Phospholipids, glycolipids, and sphingomyelin are all polar lipids found in natural membranes.
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cells. c) Many membrane components are amphipathic. d) Integral proteins in natural membranes may span the whole membrane or may be anchored to the membrane by lipid anchors. e) Different membranes in the same cell may have different amounts of the different types of polar lipids. 4. A scientist isolated the plasma membranes from some animal cells and put them in a solution of chemicals that stabilized the membranes. When she added a small amount of a salt solution, she discovered that although the membranes seemed intact, the amount of protein in the stabilizing solution had increased. These new proteins in the stabilizing solutions were probably: a) peripheral proteins. b) integral proteins. c) lipid-anchored proteins. d) seven-spanning proteins. e) trimeric G proteins. 5. A scientist wanted to genetically engineer a new type of corn plant that could withstand cold temperatures. He decided to try to change the composition of the plant’s membranes to lower the temperature of phase transition. Which of the following membrane changes might be expected to improve the cold tolerance of the plants? a) Increasing the length of the fatty acyl chains. b) Eliminating all steroids. c) Increasing the frequency of unsaturated fatty acyl chains. d) Decreasing the frequency of unsaturated fatty acyl chains.
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This note was uploaded on 03/04/2012 for the course BIOM 426 taught by Professor Staff during the Fall '08 term at WVU.

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apr01 - BIO250Y Spring Lecture questions (1-48): All...

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