RNA PROTEIN SYNTHESIS Turner College Career High School
- Slides: 25
RNA & PROTEIN SYNTHESIS Turner College & Career High School 2017
Genes Genes are coded DNA instructions that control the production of proteins. Genetic messages can be decoded by copying part of the nucleotide sequence from DNA into RNA contains coded information for making proteins.
The Structure of RNA There are three main differences between RNA and DNA: The sugar in RNA is ribose instead of deoxyribose. RNA is generally single-stranded. RNA contains uracil in place of thymine.
Types of RNA There are three main types of RNA: Messenger RNA Ribosomal RNA Transfer RNA
Messenger RNA (m. RNA) carries copies of instructions for assembling amino acids into proteins.
Ribosomal RNA Ribosomes are made up of proteins and ribosomal RNA (r. RNA). Ribosome Ribosomal RNA
Transfer RNA During protein construction, transfer RNA (t. RNA) transfers each amino acid to the ribosome. Amino Acid
Protein Synthesis DNA molecule DNA strand (template) TRANSCRIPTION m. RNA Codon TRANSLATION Protein Amino Acid
Transcription DNA is copied in the form of RNA. This first process is called transcription. The process begins at a section of DNA called a promoter.
Transcription RNA polymerase DNA
RNA Editing Some DNA within a gene is not needed to produce a protein. These areas are called introns. The DNA sequences that code for proteins are called exons.
RNA Editing The introns are cut of RNA molecules. Exon The exons are the spliced together to form m. RNA. Intron DNA Pre-m. RNA Cap Tail
The Genetic Code The genetic code is the “language” of m. RNA instructions. The code is written using four “letters” (the bases: A, U, C, and G).
The Genetic Code A codon consists of three consecutive nucleotides on m. RNA that specify a particular amino acid.
The Genetic Code Copyright Pearson Prentice Hall
Translation Translation is the decoding of an m. RNA message into a polypeptide chain (protein). Translation takes place on ribosomes. During translation, the cell uses information from messenger RNA to produce proteins. Nucleus m. RNA
Translation The ribosome binds new t. RNA molecules and amino acids as it moves along the m. RNA. Phenylalanine Methionine Ribosome m. RNA Start Codon t. RNA Lysine
Protein Synthesis Lysine t. RNA Translation direction m. RNA Ribosome
Translation The process continues until the ribosome reaches a stop codon. Polypeptide Ribosome t. RNA m. RNA
Genes & Proteins DNA m. RNA Protein
Review Questions The role of a master plan in a building is similar to the role of which molecule? 1. 2. 3. 4. Messenger RNA DNA Transfer RNA Ribosomal RNA
Review Questions A base that is present in RNA but NOT in DNA is … 1. 2. 3. 4. Thymine. Uracil. Cytosine. Adenine.
Review Questions The nucleic acid responsible for bringing individual amino acids to the ribosome is … 1. 2. 3. 4. Transfer RNA. DNA. Messenger RNA. Ribosomal RNA.
Review Questions A region of a DNA molecule that indicates to an enzyme where to bind to make RNA is the … 1. 2. 3. 4. Intron. Exon. Promoter. Codon.
Review Questions A codon typically carries sufficient information to specify a(an) … 1. 2. 3. 4. Single base pair in RNA. Single amino acid. Entire protein. Single base pair in DNA.
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