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HHB 1.3 2025
Glossary flashcards
29
Biology
Not Applicable
05/08/2025

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Term
Gene expression
Definition
translation and transcription that turn the sequence of bases in a gene into the sequence of amino acids in a protein.
Term
RNA ribonucleic acid
Definition
single stranded nucleic acid
Term
ribose
Definition
the sugar in RNA
Term
uracil
Definition
the base in RNA that replaces thymine
Term
messenger RNA
Definition
carries a copy of the DNA code from nucleus to ribosome
Term
codon
Definition
triplet of bases on mRNA that codes for one amino acid
Term
transfer RNA
Definition
transfers specific amino acids to the mRNA on the ribosomes
Term
anticodon
Definition
exposed triplet of bases on tRNA
Term
amino acid attachment site
Definition
location where an amino acid binds to a tRNA molecule
Term
ribosomal RNA
Definition
type of RNA that, along with proteins, makes up ribosomes
Term
transcription
Definition
copying of DNA sequences to make a primary transcript
Term
RNA polymerase
Definition
unwinds and separates DNA strands and adds RNA nucleotides to form mRNA primary transcript
Term
primary transcript
Definition
mRNA molecule made when DNA is transcribed
Term
exons
Definition
coding regions of the primary transcript
Term
introns
Definition
non-coding regions of the primary transcript
Term
RNA splicing
Definition
joining of exons following the removal of introns from a primary transcript
Term
mature transcript
Definition
produced by removing introns and joining exons from a primary transcript
Term
alternative RNA splicing
Definition
allows different proteins to be expressed from one gene as different mature transcripts can be made from one primary transcript by retaining different exons
Term
translation
Definition
production of a polypeptide at a ribosome using information encoded in mRNA
Term
ribosome
Definition
site of translation, composed of rRNA and protein
Term
start codon
Definition
triplet of bases on mRNA where translation will start
Term
stop codon
Definition
triplet of bases on mRNA where translation will stop
Term
amino acids
Definition
sub unit of proteins
Term
polypeptide
Definition
short strand of connected amino acids
Term
peptide bond
Definition
strong chemical link between amino acids in the primary structure of a polypeptide
Term
protein
Definition
3D structure formed from folded polypeptide chain(s)
Term
hydrogen bonds
Definition
one type of interaction between amino acids that holds the 3D structure of proteins together
Term
phenotype
Definition
outward appearance of an organism
Term
proteins and environment
Definition
factors that affect an organism’s phenotype
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