Figure 1. Types of movement across membranes. Molecules can diffuse across a. membrane down a concentration gradient without the aid of a protein or the input of. energy. Passive and active transport require membrane transport proteins. Channel. proteins carry out passive transport, but carrier proteins can carry out passive or active. transport.
Akron, Iowa. Akron is a city in Plymouth County, Iowa, United States. The population was 1,486 at the 2010 census.
Akron, IA. Sponsored Topics. Akron is a city in Plymouth County, Iowa, United States. The population was 1,489 at the 2000 census. Akron is located at 42Â°49â²31â³N 96Â°33â²24â³W / 42.82528Â°N 96.55667Â°W / 42.82528; -96.55667 (42.825289, -96.556582), along the Big Sioux River.