sample midterm answer key

sample midterm answer key - 1. (6 pts) Describe briefly...

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1 . ( 6 pts ) Describe briefly (2-4 sentences) two functions of dynein. 3 pts for each function 1. in sliding of microtubules for flagellar propulsion 2. in localizing specfic mRNAs Students may answer by naming 2 different mRNAs that are localized. 2 ( 10 pts ) Define a morphogen gradient. Give one example that we have discussed in class (2-4 sentences) 3 pts for concentration gradient 3 pts for different effects on gene expression at different concentrations 4 pts for bicoid, nanos, dpp, or any other that is correct. 3 (6 pts). The following event is triggered by a rise in intracellular free calcium: a. genomic imprinting b. the fast block to polyspermy c. the slow block to polyspermy d. stabilization of cytostatic factor e. all of the above 4 (6 pts) . Each blastomere of a 4-cell embryo can develop into a normal frog. This demonstrates: a. absence of store maternal mRNAs b. the mid-blastual transition has not yet occurred c. genomic equivalence d. the importance of morphogens e. the absence of genomic imprinting
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This test prep was uploaded on 03/19/2008 for the course MCDB 138 taught by Professor Lyon during the Fall '07 term at UCLA.

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sample midterm answer key - 1. (6 pts) Describe briefly...

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