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