ch 7 bio
Card Set Information
ch 7 bio
ch 7 bio
Who used a compound microscope to see chambers within cork and named them CELLS?
What are the principles of the Cell Theory?
Cells are the basic units of life.
All living things are made of cells.
All cells are produced from existing cells.
What type of details can electron microscopes reveal?
Details that are 1000 times smaller than those visible in light microscopes.
Which microscope can produce three-dimensional images of cell’s surface?
SCANNING ELECTRON MICROSCOPE
How do you know that a cell is a prokaryote when looking through a microscope?
THE CELL LACKS A NUCLEUS
Who are the prokaryotes?
Who encloses their DNA in a nucleus?
What can a single cell organism (like an amoeba) accomplish?
IT IS ABLE TO CARRY OUT ALL OF THE FUNCTIONS NECESSARY FOR LIFE.
What is a tissue?
A GROUP OF SIMILAR CELLS THAT PERFORM A PARTICULAR FUNCTION
In a multicellular organism, what are the levels of organization from simplest to most complex?
CELL -> TISSUE -> ORGAN -> ORGAN SYSTEM
What is homeostasis?
THE RELATIVELY CONSTANT INTERNAL PHYSICAL CONDITIONS OF AN ORGANISM
What is in the nucleus?
Nucleolus, chromatin, DNA
What is the function of the nucleus?
Which organelle breaks down organelles that are no longer useful?
Which organelle stores materials, such as water, salts, proteins and carbohydrates?
VACUOLE (Be able to identify a vacuole in a plant cell graphic).
Which structure makes proteins?
Which organelle converts the chemical energy stored in food into usable energy?
What is the function of the cytoskeleton?
Helps a cell keep it's shape
Which structures are involved in cell movement/ moving the whole cell?
Microtubules & Microfilaments
Which organelle is found in plants but not animals?
Which structure serves as the cell’s boundary from its environment?
What is the function of the cell membrane?
It regulates the movement of molecules into and out of the cell
Why does diffusion occur?
Molecules constantly move and collide with eachother
What is the diffusuion of water called?
What happens when solute concentration is the same on both sides of the membrane?
Molecules continue to move across the membrane in both directions
Why does an animal cell that is surrounded by freshwater burst?
Because osmotic pressure causes water to move into the cell
What class of molecules forms channels and pumps in the plasma membrane?
What is the process called where a solute moves from high to low concentration but requires a protein channel through the membrane (ex. Glucose)?
Which means of particle transport requires input of energy from the cell?
What is the path of protein as it is being assembled?
Ribosome -> Endoplasimic Reticulum -> Golgi Apparatus