2010Exam3

2010Exam3 - NAME _ BIOLOGY 205/SECTION 7 DEVELOPMENT-...

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NAME _____________________________ 1 BIOLOGY 205/SECTION 7 DEVELOPMENT- LILJEGREN Third Examination – April 1, 2010 Put your name at the top of each page. Please read each question carefully before answering- i.e. read the instructions . In all answers, be as specific as possible , while respecting the amount of space allotted for each answer. Use of calculators and cell phones is prohibited during the exam. No regrades for exams done in pencil. 1.) (4 pts) Name the starting and ending molecules for each of the following key biological processes: Translation Transcription ______ ______ ______ ______ 2.) (1 pt) Cells move to new positions as an embryo establishes the three germ layers during (A) Determination Write letter here _____ (B) Cleavage (C) Induction (D) Gastrulation (E) Fertilization 3.) (8 pts) We talked about rules of evidence in Developmental Biology. What are the three main types of evidence, in order from weakest to strongest ? 1. _______________________________ 2. _______________________________ 3. _______________________________ What type of evidence do each of the following experiments represent? (write 1, 2, or 3 in the blank based on your answers above): ______ Misexpression of pax6 gene in fly wings results in ectopic eye formation ______ Localization of gurken protein at the dorsal side of fly embryos ______ Using a synthetic fibronectin competitor to block gastrulation ______ Measuring changes in cell adhesion during gastrulation ______ Transplanting gray crescent cells into a normal frog embryo results in a tadpole with a 2 nd dorsal/ventral axis 4.) (2 pts, Circle one) In Drosophila, development of haploid mutant embryos has been studied. If scientists were to experimentally double the cytoplasmic content of haploid mutant eggs, they should go through one more or two more or one less or two less cell division(s) than an egg with the normal amount of DNA and cytoplasm.
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NAME _____________________________ 2 5.) (1 pt) You are studying an organism which exhibits regulative development through the second cell division, then switches to mosaic development. What would you expect to result from separating a two-celled embryo into individual cells? (Circle one) two entire embryos OR two embryo halves 6.) (2 pts) Which of the following are correct statements about the cell-cell communication that takes place during the mating process in yeast? Write letter(s) here _______ (A) ‘alpha’ cells and ‘a’ cells are competent to respond to the ‘alpha’ pheromone (B) ‘a’ cells are competent to respond to the ‘alpha’ pheromone (C) ‘alpha’ cells are competent to respond to the ‘alpha’ pheromone (D) ‘alpha’ diploid cells produce alpha pheromone which binds to the receptor produced by ‘a’ diploid cells (E) ‘alpha’ haploid cells produce ‘a’ pheromone which binds to the receptor produced by ‘a’ haploid cells 7.) (3 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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2010Exam3 - NAME _ BIOLOGY 205/SECTION 7 DEVELOPMENT-...

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