Dna structure and function (notes)
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The document provides information about DNA structure and function: - DNA is a large molecule located in the nucleus that directs protein production and controls cell activities. - DNA has a double helix structure and is made up of nucleotides containing sugar, phosphate, and nitrogenous bases. - DNA replicates itself during cell division through a process where the DNA strands separate and each strand is used as a template to create a new complementary strand.
Dna structure and function (notes)
- 1. DNA Structure and Function Biology I Mr. Nettles
- 2. Today’s Agenda – Wed. Oct. 9, 2011 Warm-up Mini-Lesson Summarization and Homework Questions
- 3. Enzymes are converted into products by the reactions they catalyze. Enzymes lower the activation energy of reactions. One enzyme can catalyze many different reactions. An enzyme is used once and then destroyed by the cell. Which best describes how enzymes function in the body? Cellular Energy Warm-Up (Nov. 9)
- 4. move substances across the cell membrane without the use of ATP. move from low concentration to high concentration by diffusion. move small molecules through the cell membrane by osmosis. move substances from a low concentration to high concentration through the use of energy. In active transport, carrier proteins Cellular Energy Warm-Up (Nov. 9)
- 5. absorb excess energy release unused energy increase the reaction rate regulate product reactivity Which best describes the role of enzymes in a chemical reaction? Cellular Energy Warm-Up (Nov. 9)
- 6. Today’s Objectives I will identify the structure of DNA. (How it looks) I will articulate the function of DNA. (What it does) I will explore DNA replication. (How it is made)
- 7. What is DNA? DNA is a large molecule that directs the making of proteins in the cell. The proteins made control all the activities and processes in the cell.
- 8. Where is DNA located? DNA is located in the nucleus of the cell.
- 9. How does DNA look? DNA forms a double helix. It looks like a twisted braid. DNA is a nucleic acid, so it’s made up of nucleotides .
- 10. How is DNA made? DNA is made through a process called DNA replication. DNA copies itself during S phase of the cell cycle .
- 11. Steps of DNA Replication The two strands of DNA separate or “unzip ”. Each “old strand” creates a “new strand” by base pairing . The enzyme, DNA polymerase , checks for errors and repairs the new DNA molecule
- 12. Nucleotides and Base Pairing Nucleotides are made up of three parts: a five – carbon sugar a phosphate group a nitrogenous base DNA nucleotides can have one of four different nitrogenous bases : Adenine (A), Thymine (T), Guanine (G), and Cytosine (C). Nitrogenous Base Pairing : A pairs with T ( A pples grow on T rees). C pairs with G ( C ars need G as).
- 13. Video about Genetic Engineering