Plasmid cloning vector DNA is usually introduced into bacterial hosts by ________.
A. ligation
B. transformation
C. plasmolysis
D. transduction
Answer: B
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The increase in cytosolic calcium within the egg during fertilization initiates
A. the slow block to polyspermy. B. the cortical reaction. C. signaling for the first cell division. D. the release of enzymes by the egg. E. All of the choices are correct.
What was the long-term effect of the introduction of myxoma virus to control rabbits in Australia?
a. The rabbits were all killed. b. Most rabbits became immune to the virus. c. The virus killed off some of the rabbit population but also infected kangaroos and wallabies. d. The virus became less virulent and the rabbits gained some immunity. e. The virus had no effect.
A(n) ________ tree simply represents phylogenetic relationships but does not indicate which organisms are more primitive relative to others. In contrast, a(n) ________ tree gives a node that serves as the common ancestor and shows the development of the species from this origin.
Fill in the blank(s) with the appropriate word(s).
What condition best describes the endogeneity problem?
A. The variance of the errors (Ui) depends on Xi. B. One of the Xi variables is correlated with the error term (Ui). C. Some variables within Xi are perfectly correlated with other variables in Xi. D. The distribution of the errors (Ui) is non-normal.