apr03test

apr03test - BIO250Y1Y April Exam 2003 Answers 1-C 11-A 21-D...

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BIO250Y1Y April Exam 2003 Answers: 1-C 11-A 21-D 31-D 41-B 51-A 61-D 2-A 12-A 22-E 32-B 42-D 52-C 62-D 3-E 13-C 23-C 33-D 43-B 53-A 63-C 4-A 14-C 24-ABCDE** 34-B 44-A 54-A 64-ABCDE** 5-D 15-D 25-B 35-B 45-A 55-D 65-E 6-B 16-B 26-C 36-B 46-A 56-B 66-C 7-B 17-C 27-B 37-D 47-D 57-A 67-B 8-D 18-E 28-B 38-B 48-D 58-D 68-A 9-C 19-B 29-B 39-ABCDE** 49-A 59-B 69-C 10-E 20-A + B* 30-A 40-B 50-D 60-E 70-D *Question 20 both A and B were accepted as right answers, see bottom of question 20 for explanation. ** These questions were not marked wrong. Please see their corresponding questions below for details. The following questions 1 through 25 are based on Section 3 lectures: 1. Which statement is INCORRECT? a) Different types of cells in a eukaryotic organism can have different numbers of cellular structures, depending on the cell’s function. b) Photosynthetic prokaryotic cells have internal membranes. c) Gram negative bacteria have two plasma membranes and no cell wall; gram positive bacteria have one plasma membrane and a cell wall. d) All prokaryotic and eukaryotic cells have a plasma membrane that controls which organic molecules and ions can enter the cell. e) The restriction of biochemical processes into membrane-bound compartments allow eukaryotic cells to grow larger than prokaryotic cells because, if prokaryotic cells get too big, diffusion does not occur fast enough for interacting molecules to “find” each other efficiently.
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Continued… 2 2. Which statement is CORRECT? a) Plant cells do not contain intermediate filaments. b) Plant cells differ from animal cells because they do not have mitochondria. c) Centrioles are found in the cells of multicellular plants and animals. d) Plasmodesmata and gap junctions are identical in structure but are given different names because they occur in plants or animals, respectively. e) In eukaryotic cells, the endoplasmic reticulum is connected to the plasma membrane. 3. Which statement is FALSE? a) Phospholipids, glycolipids, and sphingomyelin are all polar lipids found in natural membranes. b) Plant membranes contain more types of steroids than do animal membranes. c) Most membrane components are amphipathic. d) Different membranes may contain different types and proportions of polar lipids. e) Peripheral proteins are covalently bound to the surface of a membrane. 4. A scientist purified a protein from animal cells and made fluorescent antibodies to it. When she isolated pieces of the plasma membrane from another batch of animal cells and added the fluorescent antibodies, she could see fluorescence on only one side of the membrane using a fluorescence microscope. She then took some fresh pieces of plasma membrane and suspended them in a salt solution before adding the fluorescent antibodies. The plasma membrane did not become fluorescent. The protein was most likely
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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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apr03test - BIO250Y1Y April Exam 2003 Answers 1-C 11-A 21-D...

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