BIOL 124 Chapter Notes - Chapter 2-11 & 3-11: Adenine, Uracil, Guanine
Document Summary
Dna and rna store, transmit, and help express genetic information. Nucleic acids: the largest molecules in the body: composed of carbon, oxygen, hydrogen, nitrogen, and phosphorus, include two major classes of molecules, dna (deoxyribonucleic acid, rna (ribonucleic acid) Carries out the genetic instructions for protein synthesis. Adenine, guanine, cytosine, uracil replicates itself before cell division. Messenger rna carries instructions from dna for building proteins. Introns: noncoding, often repetitive, segments; considered a type of junk dna": intron dna is believed to serve as a reservoir or scrapyard of ready-to-use dna segments. Messenger rna: long nucleotide strands resembling half-dna" molecules; carries the coded information to the cytoplasm, where protein synthesis occurs. Ribosomal rna: along with proteins, forms the ribosomes, which consist of two subunits one large and one small. The two subunits types combine to form functional ribosomes, which are the sites of protein synthesis.
