Final answer:
The drug blocking H+ transporter in gastric parietal cells inhibits primary active transport, which is the energy-requiring process that moves substances against their concentration gradient.
Step-by-step explanation:
A new drug that blocks the transporter for H+ secretion in gastric parietal cells inhibits primary active transport. This transport process involves the movement of a substance from an area of lower concentration to an area of higher concentration, going against the concentration gradient, and requires energy in the form of ATP. In the context of gastric parietal cells, the proton pump (H+/K+ ATPase) uses ATP to move H+ ions into the stomach lumen, which is essential for the production of gastric acid. When this pump is blocked by a drug, the secretion of gastric acids is reduced.