Looking Inside Cells Section 2-4 7th grade Life Science I. Introduction to Section 2-4 specific functions within the cell A. Organelles carry out _________________________________________________ II. Enter the Cell layer of non-living material A. Cell Wall — a rigid ___________________________________________________ do not have cell walls 1. The cells of animals ____________________________________________ __________________________________________________________________ Protect and support the cell 2. A plant’s cell wall helps to ______________________________________ __________________________________________________________________ A strong material called cellulose 3. The cell wall is made of _______________________________________________ _____________________________________________________________________ Many materials including water can pass through it 4. Many materials, ______________________________________________________ B. Cell Membrane have cell membranes 1. All cells _______________________________________________________ what substances come into and out of a cell 2. The cell membrane controls ___________________________________________ III. Sail on to the Nucleus As the cells control center , directing all of the cell’s A. You can think of the nucleus __________________________________________________ ____________________________________________________________________________ activity B. Nuclear Envelope Protects the nucleus 1. The nuclear envelope __________________________________________________ In and out of the nucleus through pores in the 2. Materials pass ________________________________________________________ _______________________________________________________________________ nuclear envelope C. Chromatin 1. Chromatin contains ___________________, the ____________________ genetic material instructions for directing the cell’s functions __________________________________________________________________ D. Nucleolus ribosomes are made 1. Is where _______________________________________________________ 2. Ribosomes are the _____________________________________________ organelles where protein is produced IV. Organelles in the Cytoplasm A. The cytoplasm, the region ____________________________________________ between the cell membrane and the nucleus gel-like fluid B. Made up of a clear, thick, _____________________________________________ C. The fluid in the cytoplasm is __________________________________________ constantly moving D. Mitochondria “powerhouses” of the cell 1. Mitochondria are known as the __________________________________ E. Endoplasmic Reticulum 1. The endoplasmic reticulum’s passageways Carry proteins and other materials from one part of the cell to another ______________________________________________-______________________ F. Ribosomes of the endoplasmic reticulum 1. Attached to some surfaces ______________________________________ 2. Ribosomes function as _________________________________________ factories to produce proteins In the space provided draw and label EITHER a plant cell or an animal cell. Use the information provided on pages 64 or 65. G. Golgi Bodies Receive protein and other newly formed materials from the 1. The Golgi bodies ______________________________________________________ endoplasmic reticulum , package them, and distribute them ______________________________________________________________________ to other parts of the cell. ______________________________________________________________________ Release materials outside the cell 2. The Golgi bodies also ___________________________________________ H. Chloroplasts 1. Only the cells of __________________________________________________ plants and some other organisms that make their own food from sunlight and use it to make food 2. Chloroplasts captureEnergy ___________________________________________ Leaves green 3. Chloroplasts make ____________________________________________ I. Vacuoles storage areas for cells 1. Vacuoles are ___________________________________________________ J. Lysosomes round structures containing chemicals 1. Lysosomes are small ___________________________________________ food particles, old cell parts, 2. Some chemicals break down Large ____________________________________ 3. You can think of lysosomes as ___________________________________ the cell’s cleanup crew V. Specialized Cells A. Cells are often quite __________________________________________________ different from each other and are ______________________________________________________________________ specialized to perform specific functions Cells are organized into tissues, organs, 1. In many-celled organisms, ______________________________________ and organ systems __________________________________________________________________ a. A tissue is a group of similar cells that work together to carry out a life process or perform a ______________________________________________________________________ specific function ______________________________________________________________________ b. An organ is made of Different kinds of tissues that function together ______________________________________________________________________ c. An organ system is a group of organs that work together to perform a major function ____________________________________________________________________ Answer Section 2-4 Assessment questions on page 67, numbers 1a, 2a, and 3b using complete sentences. Answer on your own paper.