Three English Biochemists Unravel DNA to Unlock the Mystery of Life- - 1060L; Cite specific textual evidence when writing or speaking to support conclusions drawn from the text. Assessments: Ten multiple choice items on organ systems - Community connections: (Contact the education department for events and opportunities to engage students) St. Jude – Cure4kids Science fair/STEM challenges: Human body science fair project ideas - responsibilities of other organelles. They will present their defense in the form of a classroom trial. (Science practice 7) RST 6-8.1 Standard 1: Cell processes (1.5 weeks) GLE 0707.1.4 Illustrate how cell division occurs in sequential stages to maintain the chromosome number of species. Scaffolded (Unpacked) Ideas Cells regularly divide as an organism grows. GLE 0707.1.4 Illustrate how cell division occurs in sequential stages to maintain the chromosome number of a species. Essential questions: 1. What are the stages through which cells pass as they divide? 2. Which events occur during the different stages of cell division? 3. How does cell division ensure that all cells of the same species Sequence a series of diagrams that depict chromosome movement during cell division. Demonstrate how cell division impacts chromosomes. Explain the process of diffusion. Aligned resources: Tennessee Holt Science and Technology TE, Chapter 2, Section 1: The Diversity of Cells and Section 2: Eukaryotic Cells, p. 46-63 Chapter 3, Section 3: The Cell Cycle, Glencoe Tennessee Science Grade 7 TWE, Chapter 2, Section 1: Cell Structure, p 44-57 Chapter 3, Section 2: Moving Cellular Materials, p. 80-85 Chapter 6, Section 1: Cell Division and Mitosis, p. 174-180 Recommended activities: Academic vocabulary: cell division, diffusion, mitosis, semi-permeable, cell cycle, chromosome, homologous chromosomes, mitosis, cytokinesis Performance task: Create a graphic organizer of the cell cycle with mitosis and one of how cancer develops. (Science Practice 6) Performance task: Describe in an essay how the cell cycle including the process of mitosis is affected by cancer. (Science Practice 7)
In a mixture of two or more substances there is often more of one kind of material in one place than another. Concentration refers to the amount of a particular substance in a given amount of another substance, especially a solution or mixture. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. 4. How does the concentration affect the movement of materials? Recommended activities: (For labs and investigations, allow students to identify independent and dependent variables and controls, what tools are needed to do the gathering, how measurements will be recorded, provide evidence to support explanations or solutions and how many data are needed to support a claim.) Science Activity a Day investigation: Cell transport p. 82 Labs: 20-minute activity on diffusion - Observing movement across a membrane - (With the text, allow students to construct arguments about ideas and concepts while presenting their claims and evidence.) Informational text - In this close reading assignment, students will read about the chemical language cells used to communicate and link information to knowledge gained in the What are Cells? close reading assignment in lesson one to form an argument.- Videos: How osmosis works - Assessment questions: Ten multiple choice questions on osmosis and diffusion - Performance task: Design a demonstration that illustrates how materials move by simple diffusion across a semi-permeable membrane. (Science Practice 6) RST 6-8.3 Performance task: Students will use demonstrations of osmosis and diffusion experiments to observe the movement of water, sugars and starches across artificial and natural membrane systems. Students will develop schematic drawings to model and explain the movement of molecules across the cell membrane as an essential component of cell function. Students will use their understanding of simple membrane functions at the cellular level, combined with online & literature research to write a paper on the topic, ”Importance of Diffusion in the human body”. In their paper student groups will use arguments, supported by their schematic drawing models, and evidence from their research and experimental findings to explain how cell-based organ systems depend on diffusion as an important part of their normal functioning. (Science Practice 7) RST 6-8.8