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DNA vs RNADNA vs RNABy GBPO
What is RNA?What is RNA?
Nucleic acid involved in putting genetic code into action
long chain of nucleotides
Copied base sequence of DNA that directs protein synthesis
Functions of RNAFunctions of RNA
Involved only in protein synthesis
Controls assembly of amino acids into proteins
Messenger RNAMessenger RNA
Holds copy of original DNA segment
Carries copy to other parts of the cell
Ribosomal RNARibosomal RNA
Make up the two subunits of ribosomes
Transfer RNATransfer RNA
Carries amino acids to ribosomes as specified
Review so FarReview so FarRNA found in nucleus
Basically throw-away DNA copy that puts DNA code to work
Three kinds
mRNA
tRNA
rRNA
PolypeptidesPolypeptides
Proteins are made by joining amino acids in long chains
Only certain polypeptides make up certain amino acids.
Order they are joined determines properties of the different proteins.
CodonsCodonsgroup of three nucleotide bases in mRNA
Specify amino acid needed for protein
In decoding genetic messages the DNA needs to be converted into a strand of RNA that is used to make proteins.
Codons and Codons and PolypeptidesPolypeptides
The order of amino acids and the function determine shape.
A codon is a three-letter “word” in mRNA that stands for a certain amino acid.
ATG makes one needed for blonde hair
Codons and Codons and PolypeptidesPolypeptides
Almost all amino acids can be specified by more than one codon
All polypeptide sequences start with the AUG codon (methionine) but certain codons end, or terminate, that chain
DNA vs. RNADNA vs. RNA
DNA vs. RNADNA vs. RNA
Sugar
DNA: deoxyribose
RNA: ribose
Bases
RNA: Adenine, Uracil, Cytosine, Guanine
DNA: Adenine, Thymine, Cytosine, Guanine
DNA vs. RNADNA vs. RNA
Roles:
DNA: Holds codes for proteins
RNA: Puts codes into action
RNA: single stranded
DNA: double stranded