The loss of purine bases from a strand of DNA is typically caused by which of the following?
A. replication error
B. ultraviolet radiation
C. a spontaneous chemical reaction
D. deamination
E. double-strand DNA break
Answer: C. a spontaneous chemical reaction
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DNA replication occurs through a ________ process.
A) conservative B) semiconservative C) dispersive D) transformative
Duchenne muscular dystrophy and Becker's muscular dystrophy are caused by different mutations in the same X-linked
gene. a. True b. False
Each of the following are true of enzymes except
A. they may or may not require cofactors. B. they increase the activation energy of a reaction. C. they can be used over and over. D. their active site is specific to the substrate. E. All of the choices are true of enzymes.
Old cultures of bacteria that have lost their ability to cause disease are said to be ________.
A. pathogenic B. virulent C. attenuated D. impotent