University:
Missouri State University
Course:
CHM 554 | Biochemistry I
Academic year:

2019
Views:

274

Pages:

2
Author:

ilhisry3

Name Key CHAPTER 7 Nucleic Acids and Protein Synthesis Section 7-3 Class Date SKILL ACTIVITY- Sequencing events Protein Synthesis Protein synthesis is a complex process. In this activity you will trace the steps that are involved in the protein synthesis of a part of a molecule of oxytocin. Oxytocin is the pitultary hormone that helps regulate blood pressure, stimulates the uterus to contract during childbirth, and stimulates the production of milk after childbirth. MRNA T-A A. Protein synthesis begins with DNA in the nucleus. Below is a DNA sequence that could code for part of a molecule of oxytocin. Write the sequence of messenger RNA (mRNA) codons that would result from the transcription of this portion of DNA. The arrow marks the starting point. A-U C-G ↓ G-C ACA ATA 2 TAG 3 CIT 4 TTG 5 ACG 6 GGG 7 AAC 8 CCC 9 ATT 10 1 mRNA: ERNA UGU YAU 2 AUC GAA 4 AAC 5 UGC CCC UNG GGG UAA U-A 3 67 10 B. After transcription, mRNA attaches to a ribosome, where translation takes place. Each codon of mRNA bonds with an anticodon of a transfer RNA (RNA) and cach tRNA molecule bonds with a specific amino acid. The table below shows the mRNA codons and the amino acids for which they code. For example, if you were given the codon AGA, you can see from the table that these bases code for the amino acid arginine. A-U C-G G-C Second Base in Code A G U C Lysine Lysine Asparagine Arginine Isoleucine Methionine Isoleucine Isoleucine Tareonine Threonine Threonine Threonine Arginine Serine Asparagine Serine First Base in Code Glutamic acid Glycine Valine Alanine Glutamic acid Aspartic acid Glycine Valine G Alanine Glycine Vallne Alanine Alanine Aspartic acid Glycine Valine STOP STOP Leucine Serine STOP Tyrosine Tyrosine U Trytophan Cysteine Leucine Phenylalanine Serine Cysteine Serine Phenylalanine Serine Third Base in Code Glutamine Arginine Leucine Proline Glutamine Histidine C Arginine Arginine Leucine Praline Proline Arginine Leucine Histidine Leucine Proline Use your mRNA sequence from A to write the sequence of amino acids in this part of the oxytocin molecule. Cystane Tyrosine -Isoleucine-Glutamic Acid-As Cysteine-Proline - Lovucine Glycine-STOP Asparagine 1. How many amino acids make up this portion of the oxytocin molecule? ten 2. What is the purpose of the UAA codon? to tell the ERNA. to stop adding amino acids C. In order to get another view of the entire process of protein synthesis, label the structures on the diagram below. Nucleus TONA MBNA 1. 2. Amino acid chain RNA mRNA Transport to cytoplasm 3. MRNA ribosome 4. 5. D. To complete the chart below, give the name and a brief description of each step in protein synthesis that occurs in the part of the cell shown in C. Part of cell Name of Protein Synthesis Process Description Nucleus Transcription mRNA reads and copies the DNA's nucleotide sequences Ribosome Translation ERNA "reads" MRNA, Attaches proper amino acids to create protein. Cytoplasm

Protein Synthesis Practice Key

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