|Exposure to ultraviolet or ionizing radiation can cause ____.
|The cutting of pre-mRNA into mRNA is catalyzed by ____.
|In chromatin, DNA is spooled around proteins called ____.
|The non-coding sequences of a gene or pre-mRNA are ____.
|Different forms of the same gene are called ____.
|Nucleic acids (DNA and RNA) are polymers of ____.
|Purines have two ____, whereas pyrimidines have one.
|The sequences of a gene that remain in mRNA are ____.