AP Biology Unit 4 Review

Front

What is the role of secondary messengers in cell signaling?

Back

Secondary messengers are molecules that relay signals received at receptors on the cell surface to target molecules inside the cell, often activating or deactivating enzymes during the transduction step.

Front

What are plasmodesmata?

Back

Plasmodesmata are microscopic channels that traverse the cell walls of plant cells, allowing for the direct exchange of small soluble compounds and communication between neighboring cells.

Front

What are the three parts of a signal transduction pathway?

Back

The three parts of a signal transduction pathway are reception, transduction, and response.

Front

In which phase of the cell cycle does a cell spend the most time?

Back

A cell spends the greatest amount of time in Interphase, which includes G1, S, and G2 phases.

Front

What significant event occurs during the S-phase of the cell cycle?

Back

During the S-phase, DNA replication occurs, resulting in the duplication of the cell's genetic material.

Front

Define reception in the context of cell signaling.

Back

Reception is the first step in cell signaling where a signaling molecule binds to a receptor on the target cell's surface, initiating the signaling process.

Front

What is transduction in cell signaling?

Back

Transduction is the process by which the signal is converted into a form that can bring about a cellular response, often involving a series of molecular events.

Front

What is the response in a signal transduction pathway?

Back

The response is the final step in a signal transduction pathway where the cell reacts to the signal, which may involve changes in gene expression, enzyme activity, or cellular behavior.

Front

What is the function of gap junctions?

Back

Gap junctions are specialized intercellular connections that allow for direct communication and transfer of ions and small molecules between adjacent animal cells.

Front

What happens during the G1 phase of the cell cycle?

Back

During the G1 phase, the cell grows and carries out normal metabolic processes while preparing for DNA replication.