1. write a program to prompt the user to enter a single character and respond back whether or not the character is valid dna. 2. write a program to prompt the user to enter a single character and respond back whether or not the character is valid rna. 3. write a program to prompt the user to enter a dna sequence and respond back whether or not the sequence is valid. 4. write a program to prompt the user to enter a rna sequence and respond back whether or not the sequence is valid.

Answer 1:

dna = input("Enter DNA type: ")

dna = dna.upper()

print(dna)

if dna == "A" or dna == "B" or dna == "Z":

   print("valid")

else:

   print("invalid")

Answer 2:

rna = input("Enter DNA type: ")

rna = rna.lower()

print(rna)

if rna == "m" or rna == "t" or rna == "r":

   print("valid")

else:

   print("invalid")

Answer 3:

dnaSquence = input("Enter the DNA sequence: ")

type = "valid"

for char in dnaSquence:

   if char not in ["A", "C", "G", "T"]:

       type = "invalid"

       break

print(type)

Answer 4:

rnaSquence = input("Enter the RNA sequence: ")

type = "valid"

for char in rnaSquence:

   if char not in ["A", "C", "G", "U"]:

       type = "invalid"

       break

print("valid")

Explanation:

There are three types of DNA; Type A, Type B and Type Z.

A DNA sequence consists of; A, C, G and T.

There are three types of RNA; mRNA, tRNA and rRNA.

An RNA sequence consists of; A, C, G and U.

Code Explanations:

Code 1:

dna = input("Enter DNA type: ")

dna = dna.upper()

print(dna)

if dna == "A" or dna == "B" or dna == "Z":

   print("valid")

else:

   print("invalid")

Code 2:

rna = input("Enter DNA type: ")

rna = rna.lower()

print(rna)

if rna == "m" or rna == "t" or rna == "r":

   print("valid")

else:

   print("invalid")

Code 3:

Answer 3:

dnaSquence = input("Enter the DNA sequence: ")

type = "valid"

for char in dnaSquence:

   if char not in ["A", "C", "G", "T"]:

       type = "invalid"

       break

print(type)

Code 4:

rnaSquence = input("Enter the RNA sequence: ")

type = "valid"

for char in rnaSquence:

   if char not in ["A", "C", "G", "U"]:

       type = "invalid"

       break

print("valid")

answer

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