24-4 Transcription of DNA RNA ■ Similar to DNA but contains ribose instead of deoxyribose and uracil instead of thymine Three primary kinds Messenger RNA(mRNA)carries genetic messages from DNA to ribosomes, Small granular particles in the cytoplasm of a cell where protein synthesis takes place Ribosomal RNA(rRNA)complexed with protein provides the physical makeup of the ribosomes Transfer RNA(tRNA)transports amino acids to the ribosomes where they are joined together to make proteins Small RNAs,also called functiona/RNAs,have a variety of functions in cells,including silencing transcription and catalyzing chemical modifications of other RNA RNA ▪ Similar to DNA but contains ribose instead of deoxyribose and uracil instead of thymine ▪ Three primary kinds ▪ Messenger RNA (mRNA) carries genetic messages from DNA to ribosomes, ▪ Small granular particles in the cytoplasm of a cell where protein synthesis takes place ▪ Ribosomal RNA (rRNA) complexed with protein provides the physical makeup of the ribosomes ▪ Transfer RNA (tRNA) transports amino acids to the ribosomes where they are joined together to make proteins ▪ Small RNAs, also called functional RNAs, have a variety of functions in cells, including silencing transcription and catalyzing chemical modifications of other RNA 24-4 Transcription of DNA