Presentation on theme: "Notes E 1.1 The cell is the basic unit of living things."— Presentation transcript:
Notes E 1.1 The cell is the basic unit of living things.
Living things are different from nonliving things. Organisms’ Life Processes: – Are organized – Grow and develop – Respond to their environment – Are able to reproduce
All organisms need: Energy Certain Materials Living Space (All energy used by life on Earth comes directly or indirectly from the Sun)
All living things are made of cells. Cell=smallest unit of life that can perform basic activities Multicellular organisms have specialized cells that, together, meet basic needs.
The microscope led to the discovery of the cell. Robert Hooke and Anton van Leeuwenhoek— first to describe cells (1660s and 1670s) Microscope=the new technology that led to their discoveries
Cells come from other cells. Cell Theory (1850s): All living things made of cells Cells carry out life functions Cells come only from other cells
The cell Theory is important to the study of biology. Theory=an explanation of what is observed, must be supported by evidence Louis Pasteur used Cell Theory as a foundation for his studies: – Bacteria cause food spoilage, sour milk, diseases. – Living things don’t arise by spontaneous generation.