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Genetic code consists of

1. adenine and guanine
2. cytosine and uracil
3. cytosine and guanine
4. all the above

Correct answer: all the above

Solution

The genetic code is built from the nitrogenous bases found in nucleic acids: adenine, guanine, cytosine, and thymine in DNA, with uracil replacing thymine in RNA. Since all listed pairs contain valid bases from this set, the best choice is that all are included.

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