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    Biology: Genetics Quiz
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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

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