Final answer:
The lncRNA (long non-coding RNA) is significantly longer than siRNA, crRNA, miRNA, and piRNA, typically exceeding 200 nucleotides in length.
Step-by-step explanation:
The student has asked about the length difference among various types of regulatory RNA. Among the options given:
- siRNA (Small Interfering RNA) typically range from 20-25 nucleotides in length.
- crRNA (CRISPR RNA) varies in length depending on the system but is generally around 20 nucleotides long within the CRISPR-Cas9 system.
- miRNA (microRNA) are about 21-24 nucleotides in length.
- piRNA (PIWI-interacting RNA) are slightly longer, ranging from 26-31 nucleotides.
- lncRNA (long non-coding RNA) is significantly different in size compared to the others, as it is longer than 200 nucleotides.
Therefore, the lncRNA is different from the rest in terms of its length, being much longer.