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.
Washington County is one of the top producers of hard red winter wheat, and also produces millet, milo, corn, and sunflowers. The dairy and beef industries account for over half of the farm income in the county. Colorado Plains Regional Airport located on the north side of Akron is a huge asset to Washington County.