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.
Town of Akron, Colorado. From its beginning as a frontier town on the prairie to currently being one of the largest agricultural producing areas in Colorado, Akron has been a thriving community. Agriculture is the largest industry in Washington County, consisting primarily of dryland farming.