AP Biology Unit 4 Review

Front

What are plasmodesmata?

Back

Plasmodesmata are junctions in the cell wall of plant cells that allow for the exchange of small soluble compounds between neighboring cells.

Front

Why are receptor proteins important in cell signaling?

Back

Receptor proteins are crucial because they need the proper sequence of amino acids and a specific shape to bind to their ligands, affecting cell signaling.

Front

What occurs during anaphase in mitosis?

Back

During anaphase, sister chromatids are separated and kinetochores pull chromosomes to opposite poles of the cell.

Front

What are the three parts of a signal transduction pathway?

Back

The three parts are reception, transduction, and response.

Front

What is the correct order of the steps in mitosis?

Back

The correct order is prophase, metaphase, anaphase, and telophase.

Front

Define cell signaling.

Back

Cell signaling is the process by which cells communicate with each other through signaling molecules and receptors.

Front

What is the role of kinetochores during mitosis?

Back

Kinetochores are protein structures on the chromosome that attach to spindle fibers and help pull sister chromatids apart during anaphase.

Front

What is the function of gap junctions?

Back

Gap junctions are specialized intercellular connections that allow for direct communication between adjacent cells.

Front

Explain the significance of mutations in receptor proteins.

Back

Mutations in receptor proteins can disrupt their ability to bind ligands, leading to impaired cell signaling and potential cellular dysfunction.

Front

What happens during prophase of mitosis?

Back

During prophase, chromatin condenses into visible chromosomes, and the nuclear membrane begins to break down.