Introduction
This unit bundles the Student Expectations that address living systems at all levels of organization and how they demonstrate the complementary nature of structure and function. Cells are the basic structures of all living things with specialized parts that perform specific functions.
Prior to this Unit
Grade 6
6.12A – Understand that all organisms are composed of one or more cells.
6.12B – Recognize that the presence of a nucleus is a key factor used to determine whether a cell is prokaryotic or eukaryotic.
6.12F – Diagram the levels of organization within an ecosystem, including organism, population, community, and ecosystem.
During this Unit
Students differentiate between structure and function in animal and plant cell organelles and compare levels of organization in living organisms. Students further develop the concept that all living things are composed of cells and cells carry on similar functions. Additionally, students communicate and discuss their observations and record and organize data in their notebooks. Furthermore, students analyze and interpret information to construct reasonable explanations based on evidence from their investigations and communicate valid conclusions (supported by collected data). Students continue to demonstrate safe practices as outlined in the Texas Education Agency-approved safety standards and consider environmentally appropriate and ethical practices with resources during investigations.
After this Unit
Students will further their study of cells at a deeper level in high school Biology.
If it is a living thing or came from a living thing, it either is a cell or is made of many cells. The cell is the most basic unit of life. Cells are composed of many smaller individual component called organelles.
The organelles of cells each have a unique and specific function for the cell. Just like organs each serve specific roles within the body (digestion, circulation, respiration, mobility, etc.), the organelles serve the cell with nutrients, create proteins, hold genetic information, store water, remove wastes, and form together to create tissues that form organs to make a complete organism.
The Cell theory has three principles.
1) All living things (organisms) are made of cells.
2) All existing cells are produced by other living cells.
3) The cell is the most basic unit of structure and function in all organisms.