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midterm - chevrette

midterm - chevrette - BIOLOGY 202 MIDTERM VERSION 1 1 Dr...

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BIOLOGY 202 MIDTERM VERSION 1 1 Dr. Chevrette’s Questions (36 points) 16. (3 points) Which of the following statements is incorrect . a) The length of VNTRs varies between individuals and even in the same individual. b) Because highly repetitive DNA sequences are present at more than 100,000 copies /genome, they will be seen easily on an ethidium bromide stained agarose gel upon digestion of human DNA. c) Cesium chloride gradients can be used to isolate satellite DNA from eukaryotes. d) The C-value paradox defining the lack of correlation between the size of the genome and the biological complexity of an organism can be explained largely by the presence of repetitive DNA. e) Transposable elements, although present in the human genome, are rarely inserted into the exons of the genes. 17. (6 points) The following figure represents an ethidium bromide stained gel containing molecular weight markers (“M”), and fragments of DNA from 5 samples (1 to 5) that have been digested with restriction enzymes, and then separated according to their size. M 3 1 4 2 5 10 kb 8 kb 7 kb 6 kb 4 kb 3 kb 1 kb Based on this gel, which one of the following statements are true .
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