What was the most interesting thing that you did over Winter Break? Create a double bubble map comparing/contrasting DNA and RNA.

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Presentation transcript:

What was the most interesting thing that you did over Winter Break? Create a double bubble map comparing/contrasting DNA and RNA

Mr. Hedrick Biology 1

The making of proteins. RNA acts as a bridge between DNA and the proteins which it codes Two processes are involved Transcription Translation

The process when RNA copies part of the DNA nucleotide sequence Helicase (what does –ase mean?) unzips DNA RNA polymerase glues together the RNA nucleotides based on the DNA template Occurs in the nucleus

If Helicase unzips the DNA strand, THEN How does RNA polymerase know where to start and stop making an RNA copy of DNA? RNA polymerase binds to places on the DNA molecule known as… PROMOTERS

To make 1 protein must the entire DNA chain be copied? NO Why? Because only certain sections of DNA code for a protein and what were those sections called? GENES

Introns Do not code for a protein Exons Code for protein

The mRNA molecule is formed and both the introns and exons are copied While mRNA is in the nucleus the introns are cut (spliced) out and the remaining exons are spliced back together The final mRNA is then formed and leaves the nucleus

Occurs after transcription Occurs in cytoplasm and at the ribosomes

A group of three nucleotides A codon represents an amino acid, OR it is a start or stop codon

Start Codons AUG for RNA (most typical in eukaryote celled organisms) ATG for DNA UAG in RNA TAG in DNA Stop Codons

Transfers each amino acid to the ribosome to help assemble proteins Each tRNA carries one specific amino acid Each tRNA carries three unpaired bases called an anticodon

The directions for making a protein are in order of the four nitrogenous bases. This code is read three letters at a time, known as a codon. Each codon represents an amino acid. tRNA moves through the ribosome and its anticodons match up with the mRNA codons. The amino acids carried by the tRNA are attached until the protein is complete

DNA Transcription RNA Translation Protein Cookbook Copy specific recipe Delivers recipe to chef Chef calls for ingredients Dinner is served

Making proteins!

What is a codon? What are the 3 bases on the end of a tRNA called?

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