AP Biology Unit 4 Review

Front

What type of feedback loop do mammals use to maintain a constant body temperature?

Back

Negative feedback loop.

Front

What occurs when a ligand binds to its receptor?

Back

A conformational change in the shape of the receptor.

Front

What is the name of the phase in mitosis where the chromosomes are at opposite poles and the nuclear envelope begins to reform?

Back

Telophase.

Front

Which stage of the cell cycle is characterized by the cell no longer dividing?

Back

G0 phase.

Front

What phase follows metaphase in mitosis?

Back

Anaphase.

Front

Define homeostasis in biological systems.

Back

Homeostasis is the process by which living organisms regulate their internal environment to maintain stable, constant conditions.

Front

What is the role of receptors in cell signaling?

Back

Receptors bind to ligands and initiate a cellular response.

Front

What is the significance of negative feedback in biological systems?

Back

Negative feedback helps maintain homeostasis by counteracting changes in the internal environment.

Front

Describe the process of phosphorylation in cell signaling.

Back

Phosphorylation is the addition of a phosphate group to a molecule, often a protein, which can change the molecule's activity.

Front

What happens during anaphase in mitosis?

Back

Sister chromatids are pulled apart to opposite poles of the cell.