Open to vocab foldable Pick up glue and scissors Tuesday Warm Up

Unit 2 A View of the Cell

What is an Organelle? Literally means “Little organ” What do organs do for your body? Organelles do the same kinds of things for cells Small internal structure in a cell which carries out a specific job

Plasma Membrane A flexible boundary between the cell and its environment maintains a balance of nutrients, etc. Selective permeability  A process in which a membrane allows some molecules to pass through while keeping others out

Structure of the Plasma membrane Phospholipids A double layer that creates water-soluble outsides surrounding water insoluble insides Transport Proteins Span the entire membrane to regulate which molecules enter and which leave

What color is the plasma membrane? What two kinds of molecules make up the plasma membrane?

What color is the plasma membrane? BLUE What two kinds of molecules make up the plasma membrane? Phospholipids and Proteins

Because the YELLOW membrane only lets certain molecules through it is ____________ _____________.

Because the YELLOW membrane only lets certain molecules through it is Selectively Permeable.

Eukaryotic Cell Structures

Nucleus Contains DNA & acts as control center of the cell Nucleolus Inside the nucleus; makes the ribosomes

This shows a picture of real cells. What color is the part that contains the DNA?

Cytoplasm Gel-like material in the cell, suspending organelles It’s the “snot-like fluid” that everything floats in

Cytoplasmic Organelles Endoplasmic reticulum  Highly folded membranes for transport of materials in the cell. Site of many cellular chemical reactions Rough Endoplasmic reticulum (ER)  Have ribosomes attached Smooth ER – no ribosomes

What color is the Endoplasmic Reticulum?

Cytoplasmic Organelles Ribosomes  Small structures, free or attached to ER, which synthesize proteins

Endoplasmic Reticulum Plasma Membrane

Cytoplasmic Organelles Golgi apparatus  This organelle looks like a stack of pancakes. It modifies, sorts, & packages molecules the cell makes for export. 

Cytoplasmic Organelles Vacuoles Membrane-bound compartments for temporary storage of materials May be very large in plant cells

Cytoplasmic Organelles Lysosomes Small bodies filled with digestive enzymes that digest worn-out organelles, food particles, and even engulfed bacteria Responsible for the cell’s recycling of materials

What organ system would you compare a lysosome to?

The Digestive system!!!!!

Cytoplasmic Organelles Mitochondria Powerhouse of the cell with its own DNA that burns glucose for energy and stores it as ATP Many folds Rod-shaped

The Mighty Mitochondria!!!

There are certain organelles only found in Plant cells Cell walls Chloroplasts

Cell Wall Found outside the cell membrane in plants and bacteria, this supports and protects cells.

Cytoplasmic Organelles Chloroplasts Containing the green pigment, chlorophyll, these oval bodies capture light energy and turn it into chemical energy (photosynthesis)

Cilia and Flagella are only found in animal cells

Cytoplasmic Organelles Cilia & Flagella External microtubules that aid the cell in locomotion or feeding

Cilia Many, short hair- like structures made of microtubules that are attached to the outside of cells which help move the cell or move things past the cell

Flagella Few, long hair-like structures made of microtubules that are attached to the outside of cells which help move the cell

Cytoplasmic Organelles Cytoskeleton Tiny rods and filaments (called microtubules) that form a supporting framework for the cell and function in cytoplasmic streaming