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NAME _____________________________ 1 BIOLOGY 205/SECTION 7 DEVELOPMENT- LILJEGREN Third Examination – April 2, 2009 Please put your name at the top of each page. Read each question carefully before answering- i.e. read the instructions . Be as specific as possible, while respecting the amount of space allotted for each answer. No regrades for exams done in pencil. 1.) (4 pts) Name the key biological processes that generate each of the following molecules, and specify the starting molecules: ______ RNA _______ protein 2.) (5 pts) We talked about rules of evidence in Developmental Biology. Why do correlative experiments provide the weakest evidence for figuring out a gene’s function? ______________________________________________________________________ What type of evidence do each of the following experiments or findings represent? ____________ Using a fibronectin competitor to block frog gastrulation _______________ Observing that the blastopore always forms 180º from the site of sperm entry _______________ Finding that the blastopore forms next to the site of sperm entry in experimentally rotated eggs 3.) (3 pts) The size of a human skin cell compared to that of a human egg cell is like which of the following relationships: (more than one answer may be correct) Write letter(s) here _________ (A) Size of frog egg compared to a snake egg (B) Size of snake egg compared to a frog egg (C) Length of the average gene (unwound) to the diameter of the average protein (D) Size of fruit fly genome compared to mouse genome (E) Size of mouse genome compared to fruit fly genome (F) Diameter of the average protein to the length of the average gene (unwound) 4.) (4 pts) Order the following events in human development from the earliest to the latest . (A) Compaction (E) Implantation in the uterus (B) Gastrulation (F) Formation of blastocyst (C) Sperm formation begins (G) First differentiation event (D) Oocyte formation begins (H) Fusion of egg and sperm earliest ___<____<____<____<____<____<____<____ latest
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NAME _____________________________ 2 5.) (2 pts) If an egg is experimentally manipulated so that it has double the amount of cytoplasm compared to a normal egg, how many cell divisions would you expect for an organism that normally undergoes four cell divisions before the mid-blastula transition? (A) Three Write letter here ______ (B) Four (C) Five (D) Eight Explain in terms of the N/C ratio. __________________________________________ _______________________________________________________________________ 6.) (2 pts) Each germ layer contributes to specific organs within our bodies. Which of the following are correct? Write letter(s) here _______ (A) The ectoderm gives rise to the brain (B) The mesoderm gives rise to the lungs (C) The endoderm gives rise to the gonads (D) The ectoderm gives rise to the bones 7.) (4 pts) We’ve talked about the key contributions of several scientists to our understanding of development. Match the names of the following scientists to their
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This note was uploaded on 05/26/2011 for the course BIO 205 taught by Professor Reed during the Spring '11 term at UNC.

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