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.
Wright County, Iowa. Wright County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 13,229. The county seat is Clarion. The county was formed on January 15, 1851, and named after Silas Wright, a governor of New York, and Joseph Albert Wright, a governor of Indiana.