Write a python program called that continuously prompts the user to input a DNA strand and checks if it is valid. In order for the strand to be valid, it must only be made up of the following characters: ‘A’, ‘T’, ‘C’, and ‘G’ (in any combination; case insensitive). The program should terminate when the user enters ‘q’ or ‘Q’. Example: Enter a DNA strand (or ‘q’ to quit): AATCGCT Valid Enter a DNA strand (or ‘q’ to quit): GGCBT Invalid Enter a DNA strand (or ‘q’ to quit): aAcGGT Valid Enter a DNA strand (or ‘q’ to quit): q Goodbye

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Write a python program called that continuously prompts the user to input a DNA strand and checks if it is valid. In order for the strand to be valid, it must only be made up of the following
characters: ‘A’, ‘T’, ‘C’, and ‘G’ (in any combination; case insensitive). The program should terminate when the user enters ‘q’ or ‘Q’.
Example:
Enter a DNA strand (or ‘q’ to quit): AATCGCT
Valid
Enter a DNA strand (or ‘q’ to quit): GGCBT
Invalid
Enter a DNA strand (or ‘q’ to quit): aAcGGT
Valid
Enter a DNA strand (or ‘q’ to quit): q
Goodbye
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