Cell Theory
All living things are made up of these basic units of life.
What are cells?
These cells do not have a nucleus or membrane-bound organelles.
What are prokaryotic cells?
A large, round organelle surrounded by a double membrane.
What is a nucleus?
Stores materials such as water, salts, proteins, and carbohydrates.
What is a vacuole?
A flexible barrier that regulates what enters and leaves the cell.
What is the cell membrane?
Cells are the smallest parts of an organism that can do this.
What is perform all life functions?
These cells have a nucleus and many specialized organelles.
What are eukaryotic cells?
Folded membranes that may be “rough” or “smooth.”
What is the endoplasmic reticulum?
Breaks down worn-out organelles and materials in the cell; acts like the clean-up crew.
What are lysosomes?
Found outside the membrane in plant cells; gives structure and support.
What is the cell wall?
New cells come from this source.
What are existing cells?
This is the main molecule both types of cells contain that carries genetic information.
What is DNA?
A stack of flattened membranes that looks like pancakes.
What is the Golgi apparatus?
Provides internal support and helps the cell maintain its shape; made of microfilaments and microtubules.
What is the cytoskeleton?
Movement of molecules from high to low concentration without energy.
What is diffusion?
This concept explains that all organisms are made of cells and cells come from other cells.
What is the cell theory?
These cells are usually smaller and simpler, but still carry out all life functions.
What are prokaryotic cells?
An oval organelle with inner folds inside two membranes.
What is the mitochondrion?
Helps organize cell division in animal cells; made of microtubules and found near the nucleus.
What are centrioles?
The diffusion of water through a selectively permeable membrane.
What is osmosis?
These two levels of organization are built directly from cells working together.
What are tissues and organs?
These cells can form multicellular organisms with specialized cells.
What are eukaryotic cells?
A green organelle with stacks of membranes inside and two outer membranes.
What is the chloroplast?
Moves fluid or the entire cell using short hair-like or long whip-like structures.
What are cilia and flagella?
Process that uses energy to move molecules against the concentration gradient.
What is active transport?