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 PA Borough - Community Information. Akron Fire Company is an all volunteer fire company located in the heart of Lancaster County Pennsylvania. We serve as first due fire department for Akron Borough as well as portions of Ephrata & West Earl Townships. Our main source of support comes from our annual fund drive campaign. We strive to provide the best service possible to the residents of our community.