Presentation on theme: "A. There are three key differences between RNA and DNA 1. RNA is single stranded : DNA is double stranded 2. RNA is made of the sugar Ribose – DNA is."— Presentation transcript:
A. There are three key differences between RNA and DNA 1. RNA is single stranded : DNA is double stranded 2. RNA is made of the sugar Ribose – DNA is made of deoxyribose 3. RNA has Uracil instead of Thymine – Both DNA and RNA have four nitrogen bases the difference is U vs T
B. RNA has the job of copying DNA C. The goal of RNA is to create proteins D. There are three types, each with a different job. 1. mRNA – Messenger RNA-copies DNA to take it out in the cytoplasm 2. rRNA – Ribosomal RNA-works on matching mRNA - to create the amino acids in the correct order 3. tRNA – Transfer RNA- gives amino acids to rRNA to produce the protein.
How does information from the DNA get to the cytoplasm? How does the zipper get unzipped in DNA replication? What does the work in getting the amino acids to the worker?
A. Creates a single RNA strand instead of a double DNA strand. B. Creates mRNA that can move out into the cytoplasm for the next step.
C. In mRNA, three nitrogen bases together form a code – this is called a codon. D. Looking ahead: 1. This code is matched with an amino acid. 2. A string of amino acids form a protein.
E. Some codons code for information other than amino acids 1. UAA/UAG/UGA are stop codons. 2. AUG is an example of a start codon. 3. NOTE: For every one codon, there is only ONE amino acid that can join.