The table below provides information about RNA strands that were found to be involved in gene regulation in mammalian cells. Which strand(s) would be classified as lncRNAs? $$\begin{array} { | c | c | c | }
\hline \text { RNA strand } & \begin{array} { c }
\text { Length (number of } \
\text { nucleotide bases) }
\end{array} & \begin{array} { c }
\text { Associated } \
\text { proteins }
\end{array} \
\hline \text { I } & 340 & \begin{array} { c }
\text { Polycomb proteins, } \
\text { histone deacetylase }
\end{array} \
\hline \text { II } & 25 & \text { none } \
\hline \text { III } & 57 & \text { none } \
\hline \text { IV } & 215 & \text { DNA methylase } \
\hline
\end{array}$$

Question

The table below provides information about RNA strands that were found to be involved in gene regulation in mammalian cells. Which strand(s) would be classified as lncRNAs? $$\begin{array} { | c | c | c | } 
\hline \text { RNA strand } & \begin{array} { c } 
\text { Length (number of } \
\text { nucleotide bases) }
\end{array} & \begin{array} { c } 
\text { Associated } \
\text { proteins }
\end{array} \
\hline \text { I } & 340 & \begin{array} { c } 
\text { Polycomb proteins, } \
\text { histone deacetylase }
\end{array} \
\hline \text { II } & 25 & \text { none } \
\hline \text { III } & 57 & \text { none } \
\hline \text { IV } & 215 & \text { DNA methylase } \
\hline
\end{array}$$

Quizplus · Accepted Answer

lncRNAs are long non-coding RNAs, which are defined as RNA transcripts that are longer than 200 nucleotides and do not encode for proteins. In the given table, only RNA strand I (340 nucleotides) and RNA strand IV (215 nucleotides) have associated proteins, but neither of them are known to encode for proteins. Therefore, RNA strands I and IV would be classified as lncRNAs. RNA strands II and III are shorter than 200 nucleotides and do not have associated proteins, but they would not be classified as lncRNAs.

The Table Below Provides Information About RNA Strands That Were