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Unit 1 Key Area 3 Word Bank
Gene Expression
28
Anatomy
Intermediate
05/25/2017

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Term
Genotype
Definition
is the genetic composition of a cell
Term
Genotype is determined by
Definition
the sequence of DNA bases in its genes
Term
Phenotype is determined by
Definition
the proteins that are made when the genes are expressed
Term
The sequence of amino acids
Definition
determine the structure, shape and function of the protein produced
Term
RNA is a
Definition
single strand of RNA nucleotides
Term
RNA nucleotides contain
Definition
ribose sugar, a phosphate and a base (A,C,G or U)
Term
mRNA carries a
Definition
copy of the DNA code for a specific protein from the nucleus to the ribosome
Term
rRNA and proteins
Definition
form a ribosome
Term
tRNA carries
Definition
a specific amino acid
Term
Transcription
Definition
the copying of the DNA code for a specific protein into mRNA
Term
RNA polymerase
Definition
unwinds and unzips a specific section of DNA
Term
RNA polymerase can only add
Definition
nucleotides to the 3’ end of mRNA
Term
Primary Transcript of mRNA
Definition
the mRNA that separates from the DNA template (before splicing)
Term
Introns
Definition
non-coding regions of genes (stay in the nucleus)
Term
Exons
Definition
coding regions of genes (Exit the nucleus)
Term
Mature Transcript of mRNA
Definition
formed when introns are removed from the primary transcript and exons are spliced together
Term
The mature transcript of mRNA moves from
Definition
nucleus to a ribosome
Term
Codons
Definition
3 bases found on mRNA
Term
mRNA codons are complementary
Definition
to the triplet of bases on the original DNA strand
Term
tRNA is found
Definition
in the cytoplasm
Term
Anticodons
Definition
the triplet of bases found on tRNA
Term
tRNA anticodons are complementary
Definition
to the mRNA codons
Term
Methionine (AUG)
Definition
acts as a START codon
Term
mRNA codons UAA, UAG and UGA
Definition
do not code for amino acids but they act as STOP codons
Term
Ribosomes have
Definition
one binding site for mRNA and three binding sites for tRNA
Term
Polyribosome
Definition
a string of ribosomes carrying out multiple translation on the same mRNA strand
Term
Post-translation modifications
Definition
may be required to enable a protein to perform its specific function
Term
Post translation modifications include
Definition
cutting or combining a polypeptide chain, adding a carbohydrate or phosphate
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