RPA Science A Level Bio 4.5 CoTransport Starter Quiz

What is the process that requires energy in the form of ATP to move molecules against their concentration gradient through a protein?

• Co-transport

• Simple diffusion

• Active transport

• Facilitated diffusion

What type of protein is involved in active transport across membranes?

• Channel protein

• Transporter protein

• Receptor protein

• Enzyme protein

What is an example of co-transport?

• Transport of oxygen with carbon dioxide

• Transport of amino acids with chloride ions

• Transport of glucose with sodium ions

• Transport of water with potassium ions

What is the role of microvilli in the absorption of molecules in the small intestines?

• To increase the blood flow

• To increase the concentration gradient

• To increase the surface area of the epithelial cells

• To decrease the absorption of molecules

What causes the carrier/transporter protein to change shape in active transport?

• Attachment of ATP

• Attachment of potassium ions

• Attachment of glucose molecules

• Attachment of sodium ions

What is the main reason for using active transport instead of facilitated diffusion in the absorption of glucose in the small intestines?

• Low concentration of glucose in the lumen of the ileum

• Low concentration of glucose in the epithelial cells

• High concentration of glucose in the lumen of the ileum

• High concentration of sodium ions in the epithelial cells

What is the molecule that is actively transported from the epithelial cell into the blood in the small intestines?

• Sodium ions

• Sodium

• Glucose

• Potassium ions

What is the type of protein that enables the movement of sodium ions and glucose together in co-transport?

• Channel protein

• Co-transporter protein

• Enzyme protein

• Receptor protein

What is the reason for the constant flow of blood in the capillary during the absorption of glucose in the small intestines?

• To increase the absorption of glucose

• To carry away the absorbed glucose molecules

• To prevent the buildup of glucose in the blood

• To maintain the concentration gradient of glucose

What is the purpose of ATP in the process of active transport?

• To prevent the buildup of molecules in the cell

• To maintain the concentration gradient of molecules

• To provide energy for the carrier protein to change shape

• To enable the movement of molecules through the membrane