AP Biology: Unit 4 Review (CED)

Front

What is homeostasis?

Back

Homeostasis is the process by which cells and organisms maintain a stable internal environment despite changes in external conditions.

Front

Which process is NOT a way cells maintain homeostasis?

Back

Creating DNA is not a way cells maintain homeostasis.

Front

What are the three parts of a signal transduction pathway?

Back

The three parts are reception, transduction, and response.

Front

What happens when a ligand binds to its receptor?

Back

A conformational change occurs in the shape of the receptor.

Front

What is the role of signal transduction pathways in the cell cycle?

Back

Signal transduction pathways are directly involved in the regulation of the cell cycle.

Front

What is the function of the M checkpoint in the cell cycle?

Back

The M checkpoint ensures that nondisjunction does not take place during cell division.

Front

Define 'ligand'.

Back

A ligand is a molecule that binds to a receptor to initiate a signal transduction pathway.

Front

What is the significance of the G1 checkpoint?

Back

The G1 checkpoint assesses cell size, DNA integrity, and nutrient availability before the cell enters the S phase.

Front

What occurs during the transduction phase of signal transduction?

Back

During transduction, the signal is converted into a form that can bring about a cellular response.

Front

What is a receptor in the context of cell signaling?

Back

A receptor is a protein on the cell surface or inside the cell that binds to specific ligands.