AP Biology Exam - Unit 4 Review

Front

What is a signal transduction pathway?

Back

A series of molecular events and chemical reactions that lead to a cellular response after a signal is received.

Front

List the four main stages of a signal transduction pathway.

Back

1. Reception 2. Transduction 3. Amplification 4. Response

Front

What is the role of a ligand in cell communication?

Back

A ligand is a signaling molecule that binds to a receptor to initiate a response in the target cell.

Front

Define 'receptor' in the context of cell signaling.

Back

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

Front

What happens during the reception stage of signal transduction?

Back

The ligand binds to the receptor, triggering a conformational change that activates the receptor.

Front

Explain the transduction stage in signal transduction pathways.

Back

Transduction involves the conversion of the signal into a form that can bring about a cellular response, often through a cascade of molecular interactions.

Front

What is amplification in signal transduction?

Back

Amplification is the process by which a small number of signaling molecules can produce a large effect in the target cell.

Front

Describe the response stage of a signal transduction pathway.

Back

The response stage is when the cell executes a specific action, such as gene expression, enzyme activation, or changes in cell behavior.

Front

What is interphase in the cell cycle?

Back

Interphase is the phase of the cell cycle where the cell prepares for division, including DNA replication and growth.

Front

How many chromosomes do fruit fly daughter cells have after mitosis?

Back

Fruit fly daughter cells have 8 chromosomes after mitosis.