AP Biology Unit 4 Review

Front

What are the three parts of a signal transduction pathway?

Back

Reception, Transduction, Response

Front

Which component is NOT involved in the transduction step of a signal transduction pathway?

Back

Ligands

Front

What occurs during anaphase in cell division?

Back

Sister chromatids are separated and kinetochores begin pulling chromosomes to opposite poles.

Front

How do cyclin and CdK interact during the cell cycle?

Back

Cyclin interacts with CdK to initiate the mitotic phase.

Front

What type of feedback mechanism is represented by the release of ADH when dehydrated?

Back

Negative feedback.

Front

Define signal transduction.

Back

The process by which a cell responds to external signals through a series of molecular events.

Front

What role do secondary messengers play in signal transduction?

Back

They amplify the signal within the cell after the initial receptor activation.

Front

What is the function of cyclins in the cell cycle?

Back

Cyclins regulate the timing of the cell cycle by activating cyclin-dependent kinases (CdKs).

Front

What is a phosphorylation cascade?

Back

A series of events where one protein kinase activates another, leading to a rapid amplification of the signal.

Front

What is the role of ligands in signal transduction?

Back

Ligands are molecules that bind to receptors to initiate the signal transduction pathway.