AP Biology Unit 4 Review

Front

What is transduction in cell signaling?

Back

Transduction is the process by which a cell converts an external signal into a functional response, often involving amplification of the signal through secondary messengers.

Front

What are ligands in cell signaling?

Back

Ligands are molecules that bind to receptors on cells to initiate a signaling cascade.

Front

What is metastasis in relation to cancer?

Back

Metastasis is the spread of cancer cells from the original tumor to other parts of the body.

Front

What happens when a ligand binds to its receptor?

Back

The binding of a ligand to its receptor causes a conformational change in the receptor, activating it.

Front

What is the role of secondary messengers in cell signaling?

Back

Secondary messengers amplify the signal received by the receptor and help propagate the signal within the cell.

Front

What is a phosphorylation cascade?

Back

A phosphorylation cascade is a series of chemical reactions in a cell where one enzyme phosphorylates another, leading to a chain reaction that amplifies the signal.

Front

What is the significance of receptor shape in cell signaling?

Back

The specific shape of a receptor is crucial for its ability to bind to its ligand; any mutation that alters this shape can disrupt signaling.

Front

What occurs during telophase in the cell cycle?

Back

During telophase, the chromosomes arrive at opposite poles of the cell, and the nuclear envelope re-forms around each set of chromosomes.

Front

How do mutations in receptor proteins affect cell signaling?

Back

Mutations can alter the receptor's shape, polarity, or amino acid sequence, preventing it from properly binding to its ligand and disrupting the signaling pathway.

Front

What is the function of protein modification in cell signaling?

Back

Protein modification, such as phosphorylation, can activate or deactivate proteins involved in signaling pathways, thus regulating cellular responses.