You should be able to define the following:

Genome
DNA
RNA
mRNA
Transciption
Translation
Intron
Exon
Locus
Gene
Pseudogene
Protein
Primary strucure
Secondary stucture
Tertiary Structure
Quaternary Structure
Amino Acid
Recombination
Transistion
Transversion
Mutation
Allele
Genetic code
Chromosome
Haploid
Diploid
Expressed Sequence Tag (EST)
Open Reading Frame (ORF)
Splice site
Chi squared