To find out which sequence represents a strand of RNA bases, it's important to know the key difference between RNA and DNA bases.
In RNA, the base uracil (U) is used instead of thymine (T), which is found in DNA. The four RNA bases are:
- Adenine (A)
- Uracil (U)
- Cytosine (C)
- Guanine (G)
Given the four options:
1. TGGCTCGAA
2. UGGCUCGAA
3. GTTAGTGCC
4. CAATCTAGG
The correct sequence for RNA must contain uracil (U) and must not contain thymine (T).
Let's go through each option:
1. TGGCTCGAA - Contains thymine (T). This is not a strand of RNA.
2. UGGCUCGAA - Contains uracil (U) and no thymine (T). This is a strand of RNA.
3. GTTAGTGCC - Contains thymine (T). This is not a strand of RNA.
4. CAATCTAGG - Contains thymine (T). This is not a strand of RNA.
The correct answer is:
UGGCUCGAA
This sequence exclusively contains uracil (U), making it an RNA strand.
