RNA Ribonucleic Acid Working copy of DNA Acts

RNA • Ribonucleic Acid • Working copy of DNA • Acts like copy of original architectural blueprints of a building - copies are sent to worksite so original is not damaged • carries the instructions! Just like a messenger on a bike in the DC area carrying mail to another office or building http: //www. brightstorm. com/science/biology/molecul ar-biology/rna-structure/

RNA Structure • Long chain of nucleotides, similar to DNA • Phosphate group • Nitrogenous base (uracil, adenine, guanine, cytosine) • 5 -carbon sugar (ribose)

DNA VS. RNA DNA RNA 5 -Carbon sugar is deoxyribose 5 -carbon sugar is ribose Nitrogenous bases are thymine, adenine, cytosine, guanine Nitrogenous bases are uracil, adenine, cytosine, guanine double-stranded single-stranded Very long Usually short

Using the Book CD, open the Concept in Motion on page 336. The students will move the correct function to each RNA type.

This shows how the complementary DNA strand is copied into the m. RNA. Starting here: DNA m. RNA A === T A ===T T == =A A === U G === C C === G A === U T === A G === C A === U

Types of RNA Messenger RNA (m. RNA) RNA copy made directly from DNA Carries copies of instructions for assembling amino acids into proteins; serves as messenger from DNA to rest of cell Ribosomal RNA (r. RNA) Along with other proteins, makes up ribosome where proteins are assembled Transfer RNA (t. RNA) - looks During protein construction, like a “t” transfers each amino acid to ribosome as it is specified for by coded messages in m. RNA

Show the video on Transcription, the first step of protein synthesis. http: //www. hhmi. org/biointeractive/dna-transcription-basic-detail Activities for today: Transcription Worksheet page 112 Comparing DNA replication and Transcription Worksheet p age 113