| In DNA, guanine forms three hydrogen bonds with ____. |
codon |
| A ____ is a regulatory sequence upstream (5') of a gene. |
cytosine |
| A ____ is a sequence of three nucleotides in DNA or mRNA. |
DNA |
| Any observable trait of an organism is a ____. |
phenotype |
| A mutation can be an insertion, deletion, or ____ of nucleotides. |
promoter |
| A protein's amino acid sequence determines its ____. |
rRNA |
| Biological information flows from ____ to RNA to protein. |
shape |
| Ribosomes are complexes of ____ and protein. |
substitution |
