The regions of the heterogeneous nuclear RNA that must be spliced out to form functional RNA are called:
a. promoter sites.
b. introns.
c. exons.
d. anticodon.
ANS: B
When the mRNA is first transcribed from the DNA template, it reflects exactly the base se-quence of the DNA. In eukaryotes, many RNA sequences are removed by nuclear enzymes, and the remaining sequences are spliced together to form the functional mRNA that migrates to the cytoplasm. The excised sequences are called introns (intervening sequences), and the sequences that are left to code for proteins are called exons. In translation, RNA directs the synthesis of a polypeptide, a cloverleaf-shaped strand of about 80 nucleotides. The tRNA molecule has a site where an amino acid attaches. The three-nucleotide sequence at the opposite side of the clover-leaf is called the anticodon.
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