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Hunsicker Semester 2 Quiz 4
Chapter 11: Protein Synthesis
23
Science
10th Grade
03/04/2008

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Term
Polypeptide
Definition
End product of TRANSLATION (small chain of amino acids)
Term
AUG
Definition
START codon that begins TRANSLATION; codes for METHIONINE.
Term
mRNA
Definition
Single strand messenger molecule from nucleus -> cytoplasm
Term

Activation

Definition
Each amino acid must be ENERGIZED before binding to a t-RNA
Term
Template
Definition
Single-strand of DNA that is copied during TRANSCRIPTION.
Term
Termination
Definition
Occurs when STOP CODONS are reached; ribosome + polypeptide separate
Term

Initiation

Definition

Precedes translation: (1) Ribosome binds to mRNA; (2) AA-tRNA to ribosome

Term
Non-overlapping
Definition
Translation shifts down 3 bases (not 1) to new TRIPLET codon on A site.
Term
Ribosomes
Definition
Organelle translates mRNA -> POLYPEPTIDE
Term
Codon
Definition
Name for NUCLEIC acid message on mRNA.
Term
Triplet Code
Definition
During translation, CODON of mRNA is read 3 nitrogen bases at a time.
Term
Ambiguous
Definition
Each CODON codes for more than one AMINO ACID.
Term
Elongation
Definition
Polypeptide chain LENGTHENS during translation.
Term
Universal Code
Definition

TRIPLET codon (eg. UUU) in all species codes for same amino acid (phe)

Term
hnRNA
Definition
End product of TRANSCRIPTION; modified & shortened -> mRNA
Term
Redundant
Definition

More codons (64) than there are AMINO ACIDS (20).

Term
Anticodon
Definition
Nitrogen base triplet on t-RNA; complements codon of mRNA.
Term
Translocation
Definition
SHIFTING of AA-tRNA from A to P site of a ribosome.
Term
Aminoacyl-tRNA syn.
Definition
ENZYME: Activates & transfers AMINO ACIDS to specific t-RNAs.
Term
Translation
Definition
CYTOPLASMIC process: converts mRNA -> polypeptide chain.
Term
Coupled Synthesis
Definition
Translation begins BEFORE transcription is finished.
Term
Transcription
Definition
NUCLEAR process; converts DNA -> mRNA
Term
UAA, UGA, UAG
Definition
Stop codons; cause TERMINATION of translation.
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