Cell Signaling Quiz

What is the role of a ligand in cell signaling?

• To provide energy for cellular processes

• To transport ions across the cell membrane

• To break down proteins in the cell

• To bind to a receptor and initiate a signaling pathway

What is phosphorylation?

• The removal of a phosphate group from a protein

• The addition of a phosphate group to a protein

• The breakdown of glucose molecules

• The synthesis of DNA

Tags

NGSS.HS-LS2-5

Which enzyme is responsible for adding phosphate groups to proteins?

• Amylase

• Kinase

• Lipase

• Phosphatase

What is a second messenger in cell signaling?

• A small, non-protein molecule that relays signals

• A protein that directly activates genes

• A receptor on the cell surface

• A molecule that breaks down ATP

What is the function of calcium ions in cell signaling?

• To synthesize proteins

• To act as a second messenger

• To provide structural support to the cell

• To transport oxygen in the blood

What happens when a ligand binds to a cell-surface receptor?

• The receptor releases energy

• The receptor moves to the nucleus

• The receptor's intracellular domain changes shape

• The receptor is destroyed

What is the MAPK signaling cascade?

• A pathway that uses lipids to transmit signals

• A three-tiered kinase signaling pathway

• A process of DNA replication

• A method of protein synthesis

What is the role of protein kinase A (PKA) in cell signaling?

• To break down glucose

• To activate transcription factors

• To transport ions across membranes

• To phosphorylate target proteins

What is the function of phosphatases in cell signaling?

• To remove phosphate groups from proteins

• To transport calcium ions

• To add phosphate groups to proteins

• To synthesize ATP

What is the significance of the term 'upstream' in signal transduction pathways?

• It refers to molecules and events that occur later in the pathway

• It refers to the synthesis of proteins

• It describes molecules and events that come earlier in the pathway

• It indicates the direction of ion flow