Chapter 3 Cell Biology Lecture Slides

Because learning changes everything. ® Chapter 3 Cell Biology Chapter Readings (Lecture) Sections 3.1, 3.3, & 3.4, 3.5, 3.7, 3.8, 3.9 (Lab) Sections 3.2, 3.6, 3.10  3.1 Functions of the Cell Ge...

Because learning changes everything. ® Chapter 3 Cell Biology Chapter Readings (Lecture) Sections 3.1, 3.3, & 3.4, 3.5, 3.7, 3.8, 3.9 (Lab) Sections 3.2, 3.6, 3.10  3.1 Functions of the Cell General parts of a cell: Plasma (cell) membrane – outer boundary that allows cell interaction with its external environment. Nucleus – directs cell activities. Cytoplasm – located between plasma membrane and nucleus; contains organelles that perform specific functions. © McGraw Hill, LLC 2  Characteristic functions of the cell Cell metabolism and energy use – includes all chemical reactions that occur in the cell and often involves energy transfer and production of heat. Synthesis of molecules, such as proteins, nucleic acids, and lipids, that are specific for the type of cell. Communication - cells produce and receive electrical and chemical signals. Reproduction and inheritance - each cell contains a complete copy of all the genetic information (D NA) for the individual that determines the structural and functional characteristics of the cell; some cells are specialized as gametes for the transmission of genetic information to the next generation. © McGraw Hill, LLC 3  A Human Cell Access the text alternative for slide images. © McGraw Hill, LLC 4  3.3 Plasma Membrane Functions: A boundary separating the cytoplasmic (intracellular) substances from the extracellular environment of the cells. Encloses and supports the cell contents. Attaches to the extracellular environment or to other cells. The ability to recognize and communicate with other cells. Determines what moves into and out of cells (selective permeability). © McGraw Hill, LLC 5  Production of a membrane potential An electrical charge difference across the plasma membrane that results from the cell’s regulation of ion movement into and out of the cell. There are more positively charged ions along the outside of the plasma membrane, giving it a positive charge. There are more negatively charged ions and proteins on the inside of the plasma membrane, giving it a negative charge. © McGraw Hill, LLC 6