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Chapter 1 Definitions
Chapter 1 Learning Objective Definitions
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Biology
Undergraduate 4
02/22/2012

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Term
intron
Definition
segment of DNA or RNA molecule that doesn't code for proteins and interrupts the sequence of genes
Term
exon
Definition
contains information coding for a protein or peptide sequence
Term
RNA Splicing
Definition
modification of RNA after transcription, removing introns and joining exons; used by mRNA before translation
Term
mRNA
Definition
molecule of RNA encoding a chemical blueprint for a protein product; transcribed from DNA
Term
tRNA
Definition
bridges the 4 lette code of mRNA to proteins
Term
alpha-helix
Definition
common motif in secondary structure of proteins; every backbone NH group donates a H-bond to the backbone CO group
Term
beta-sheet
Definition
second form of secondary structure for proteins; beta strands connected by 2 or 3 backbone H-bonds
Term
replication
Definition
copying DNA strands
Term
transcription
Definition
synthesizing RNA from DNA
Term
translation
Definition
decoding RNA into proteins
Term
Okazaki fragments
Definition
short molecules of single stranded DNA formed on the lagging strand during replication
Term
promoter
Definition
starting region of a gene in transcription
Term
DNA polymerase
Definition
enzyme reads a DNA strand to synthesize the new strand in replication
Term
RNA polymerase
Definition
necessary enzyme to produe RNA chains in transcription
Term
ribosome
Definition
synthesizes protein chains; assembles amino acids to form the protein molecule
Term
codon
Definition
sequence of three nucletides which form a unit of genetic code in DNA or RNA
Term
anti-codon
Definition
complementary nucleotide sequence in mRNA during translation in protein synthesis
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