Unit 4 Test Review: Cell Communication & Cell Cycle 2024

Front

What is a Positive Feedback Response?

Back

A Positive Feedback Response is a process in which the output of a system amplifies the initial stimulus, leading to an increase in the response. An example is the release of hormones by skin cells to signal platelets during bleeding, which in turn signal more platelets.

Front

What happens if the S phase is eliminated from the cell cycle?

Back

If the S phase is eliminated, the daughter cells will have half the genetic material found in the parent cell, as DNA replication does not occur.

Front

What is apoptosis?

Back

Apoptosis, also known as programmed cell death, is a cellular process where cells undergo an orderly death in response to signals, which is crucial for development and maintaining homeostasis.

Front

How do you inherit chromosomes from your parents?

Back

You inherit half your chromosomes from your mother and half from your father, resulting in a complete set of chromosomes.

Front

What are the three steps of signal transduction?

Back

The three steps of signal transduction are reception (detecting a signal), transduction (converting the signal into a cellular response), and response (the actual change in the cell's behavior or function).

Front

Define signal reception in cell communication.

Back

Signal reception is the first step in cell communication where a cell detects a signaling molecule (ligand) through specific receptors on its surface.

Front

What is the role of platelets in wound healing?

Back

Platelets play a crucial role in wound healing by releasing hormones that signal other platelets to aggregate and form a clot, stopping the bleeding.

Front

Explain the difference between positive and negative feedback mechanisms.

Back

Positive feedback amplifies a response or process, while negative feedback reduces or inhibits a response to maintain homeostasis.

Front

What is the significance of the S phase in the cell cycle?

Back

The S phase is significant because it is the stage where DNA replication occurs, ensuring that each daughter cell receives a complete set of genetic material.

Front

What is a receptor in the context of cell signaling?

Back

A receptor is a protein molecule on the surface of a cell that binds to signaling molecules (ligands) and initiates a cellular response.