Question

what do adenine, cytosine, guanine, thymine, and uracil have in common?
○ they are all found in rna.
○ they make up the enzymes found in all organisms.
○ they are all found in dna.
○ they make up the nucleic acids found in all organisms.

Explanation:

1. Analyze Option 1: Thymine is not in RNA (RNA has uracil instead), so this is incorrect.
2. Analyze Option 2: These are nitrogenous bases, not enzymes (enzymes are proteins/RNA catalysts), so this is incorrect.
3. Analyze Option 3: Uracil is not in DNA (DNA has thymine), so this is incorrect.
4. Analyze Option 4: Adenine, cytosine, guanine, thymine (in DNA) and uracil (in RNA) are nitrogenous bases that make up nucleic acids (DNA and RNA), which are present in all organisms. So this is correct.

Answer:

They make up the nucleic acids found in all organisms.