RNA Do Now: Turn in Lab (Strawberry DNA) Begin working on the 10-1 review guide – it will be your homework tonight.
RNA: Ribonucleic Acid • RNA is a polymer of nucleotides, just like DNA. • There are a few important differences though: • RNA processes information, DNA stores it. • RNA is single stranded, DNA is double stranded. • In RNA, the base uracil (U) replaces thymine (T)… there is no T in RNA • RNA nucleotides contain the sugar ribose, not deoxyribose (That’s where the names come from)
RNA Structure Single stranded A-U, G-C Many shapes possible
RNA Functions DNA stores information (like a hard drive or thumb drive) and never leaves the nucleus of a cell. RNA uses that information to make proteins. Can be found anywhere in a cell.
Types of RNA There are 3 major types of RNA molecules, each with their own structure and function. They are mRNA, tRNA, and rRNA.
rRNA = “R”ibosome RNA Ribosomes are made of rRNA – that’s where their name comes from. rRNA is folded up on itself many times – making a ball-like, globular structure
mRNA = “M”essenger RNA mRNA takes messages from the DNA to the rest of the cell. mRNA is a copy of the instructions to make one protein. mRNA’s structure is a straight chain of nucleotides, like a ribbon.
tRNA = “T”ransfer RNA tRNA has an unusual “cloverleaf” structure. tRNA is needed during the protein-building process because it carries an amino acid and TRANSFERS it to the new protein.
The “Central Dogma” of Molecular Biology A dogma is a central belief, assumption or principle of thought. The central dogma of how DNA controls a cell is simple: DNA RNA Protein
The Big Idea (aka “central dogma”) Replication Transcription Translation DNA mRNA Protein
It’s Your Turn For the remainder of the period, complete your RNA notes, then begin working on the 10-1 review. We are DONE with 10-1, DNA. There will be a quiz tomorrow. Coach class is tomorrow – be there if you need to be!