Homeostasis, Cell Structure & Function Flashcards
What is homeostasis?
The process of maintaining balance in an organism’s internal environment. It kind-of means to like maintain balance.
What are 2 examples of homeostasis?
Defending against viruses and bacteria.
Thermoregulation.
Balance.
How many principles are there in the Cell Theory?
There are 3 principles.
What are the differences between eukaryotic and prokaryotic cells?
Prokaryotic cells are cells without a nucleus and eukaryotic cells contain a nucleus, much larger than prokaryotic cells.
What is the Cell Theory?
It is one of the fundamental ideas of modern biology and includes three principles.
Explain what a plasma membrane is.
A plasma membrane is a special boundary that helps control what enters and leaves the cell.
What are the two basic kinds of cells?
Eukaryotic and prokaryotic cells.
What is selective permeability?
Selective permeability allows some substances to pass through while keeping others out. Not all are allowed on.
What is phospholipid bilayer?
Phospholipid bilayer is when two layers of phospholipids are arranged to allow the membrane to exist in a watery environment.
What color is the Scanning Power lens?
Red (4x)
What color is the Low Power lens?
Yellow (10x)
What color is the High Power Lens?
Blue (40x)
What color is the Oil Immersion Lens?
White (100x)
When a cell is placed in a(n) ____ solution, the concentration of the solute outside of the cell is higher than it is inside.
Hypertonic
How do active and passive transport help a cell respond to changes in the environment?
By moving materials across the cell membrane.
Together, the different types of transport allow a cell to interact with its environment while maintaining ____.
Homeostasis/ maintaining balance
Select the functions of proteins in the plasma membrane.
Proteins that stick out from the plasma membrane define the cell’s characteristics and help cells identify chemical signals.
Proteins span the entire membrane and create tunnels through which certain substances enter and leave the cell.
When found on the outer surface of the plasma membrane, proteins called receptors transmit signals to the inside of the cell.
Proteins help to prevent the fatty-acid tails of the phospholipid bilayer from sticking together.
Proteins at the inner surface of the plasma membrane anchor the plasma membrane to the cell’s internal support structure, giving the cell its shape.
Proteins span the entire membrane and create tunnels through which certain substances enter and leave the cell.
When found on the outer surface of the plasma membrane, proteins called receptors transmit signals to the inside of the cell.
Proteins at the inner surface of the plasma membrane anchor the plasma membrane to the cell’s internal support structure, giving the cell its shape.
