Question

which of the following is unique only to rna? contains the nitrogen base thymine single stranded double stranded contains the nitrogen base cytosine

Explanation:

1. Analyze "Contains the nitrogen base thymine": Thymine is in DNA, not unique to RNA.
2. Analyze "Single stranded": RNA is typically single - stranded, while DNA is double - stranded. This is a characteristic more unique to RNA.
3. Analyze "Double stranded": DNA is double - stranded, RNA is not typically double - stranded, so this is not unique to RNA.
4. Analyze "Contains the nitrogen base cytosine": Both DNA and RNA contain cytosine, so it's not unique to RNA.

Answer:

B. Single stranded