In 2013, Railroads Transported What Percentage of All Intercity Ton

question 46

Multiple Choice

In 2013, railroads transported what percentage of all intercity ton miles moved by all modes?

• A) 17.1 percent
• B) 3.0 percent
• C) 9.4 percent
• D) 5.2 percent

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Definitions:

Transcribed DNA Strand

The strand of DNA that serves as a template for RNA synthesis during the process of transcription.

Introns

Non-coding sections of an RNA transcript, or the DNA encoding it, that are spliced out before the RNA molecule is translated into a protein.

Pre-mRNA

RNA precursor to mRNA in eukaryotes; contains both introns and exons.

Exon Combinations

Variations in the assembly of exons during mRNA processing, resulting in different mRNA molecules from the same DNA sequence.