Cell Cycle
What are the three steps in a signal transduction pathway?
What is reception, transduction, response
Negative feedback is an example of a __________ mechanism.
homeostatic
At this phase, chromosomes line up in the middle of the dividing cell.
Metaphase
These molecules can move through the membrane and initiate response within the cell
What is nonpolar/hydrophobic
Describe negative feedback.
Negative feedback reduces change and returns to the original state.
During mitosis, the cell splits into 2 _______________.
Daughter cells
What percentage of a cells life will be spent in interphase?
about 90%
A molecule that specifically binds to a receptor is known as this
What is ligand
Describe positive feedback.
Positive feedback increases change beyond a set point.
This phase happens along with cytokinesis (splitting of cytoplasm).
telophase
The receptor for a steroid would be found where?
Inside of the cell or nucleus because a steroid is a type of lipid and lipids are nonpolar.
This type of signaling involves numerous cells responding to a nearby cell's release of chemicals
What is paracrine signaling
Give 2 examples of negative feedback.
Blood glucose, temperature, heart rate, cell communication, ect.
Explain what happens in each phase of the cell cycle.
G1 - cell growth
S - synthesis of more DNA
G2 - cell growth
M - mitosis
A signaling molecule that is hydrophilic/polar will bind to a receptor here
What is in the cell membrane
Give one example of positive feedback and explain why it is positive.
Birth, blood clotting, lactation
All increase change rather than decreasing it.
This is the name of the protein that phosphorylates other proteins during a transduction cascade
Kinase