Some mutagens cause genetic changes that can be "corrected" by reexposing cells to the same mutagen. Other mutagens do not behave in this way. Provide one example of each of these two types of agents and describe the mutational changes caused in
Explain why some mutagens behave in one way, whereas others do not.
Mutagens that cause base substitutions are "corrected" by mutagens of the same class (nitrous acid, 2-aminopurine, and 5-bromouracil). Frameshift mutations are "corrected" by the same class of frameshift mutagens, but not by mutagens that cause base substitutions. X rays cause major structural changes in chromosomes (deletions, translocations, etc.) and are not "corrected" by any mutagen, including X rays.
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During the photosynthetic process, __________ diffuses into the leaf, while __________ diffuses out
of the leaf. a. carbon dioxide; oxygen b. oxygen; carbon dioxide c. oxygen; water vapor d. water vapor; carbon dioxide e. water vapor; oxygen
The ________ regulates the amount of light entering the eye
Fill in the blank(s) with correct word
When did the first eukaryotic cell form?
A) 2.1 thousand years ago B) 2.1 million years ago C) 2.1 billion years ago D) 3.7 billion years ago
The paramedic is in the BEST position to formulate an appropriate treatment plan for an ill patient if the paramedic:
A) is able to identify the etiology of the patient's illness. B) obtains a complete list of all the patient's medications. C) performs a head-to-toe exam to detect all abnormalities. D) gathers a reliable medical history from the patient's family.