At the beginning of this century there was a general announcement regarding the sequencing of the human genome and the genomes of many other multicellular eukaryotes. There was surprise expressed by many that the number of protein-coding sequences is much smaller than they had expected. Which of the following accounts for most of the rest?
A)"junk" DNA that serves no possible purpose
B)rRNA and tRNA coding sequences
C)DNA that is translated directly without being transcribed
D)non-protein coding DNA that is transcribed into several kinds of small RNAs with biological function
E)non-protein coding DNA that is transcribed into several kinds of small RNAs without biological function

Question

Quizplus · Accepted Answer

Non-protein coding DNA that is transcribed into several kinds of small RNAs with biological function accounts for most of the rest of the genome. This includes miRNAs, siRNAs, and other types of small regulatory RNAs that play important roles in gene expression and other biological processes.

At the Beginning of This Century There Was a General