ps1q - MIT Department of Biology 7.014 Introductory...

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MIT Department of Biology 7.014 Introductory Biology, Spring 2004 7.014 Problem Set 1 Please print out this problem set and record your answers on the printed copy. Problem sets will not be accepted late. Question 1 a) Describe the conditions of the atmosphere on prebiotic earth and how these conditions differ from what is found today. b) Describe the proposed first organism as it compares to modern organisms; include the type of genetic material and the source of energy it may have used. c) Describe the process that led to an O 2 atmosphere on earth and how this change in atmospheric conditions influenced the course of evolution. Question 2 You are given four test tubes, each contains cells from a different organism. One tube contains bacterial cells, one contains yeast cells (eukaryotic), one contains human cells and the last contains dinosaur cells. Can you identify the cells from each tube if you are given a light microscope? Explain your answer. 1
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Question 3 Growth factor receptors (shown below) are transmembrane proteins found on the cell surface. H 2 C O P O O O H 2 C O P O O O CH CH CH CH CH CH CH CH CH CH C O O C H CH CH CH CH CH CH CH CH CH CH C O O C H 2 2 2 2 2 2 2 2 2 2 H 2 C O P O O O 2 2 2 2 2 2 2 2 2 2 H 2 C O P O O O H 2 C O P O O O H 2 C O P O O O CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 C O O C C O O C CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 H H H H 2 C O P O O O CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 C O O C C O O C CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 H H H H 2 C O P O O O extracellular O O O O P O O H H H H H O P H H H H O C H C H H H H C C C C
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ps1q - MIT Department of Biology 7.014 Introductory...

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