It is not uncommon for people to think of the membrane as being a type of barrier. After all, it separates one compartment from another. However, there are certain molecules that are able to cross the membrane and enter into an adjacent compartment or leave it altogether. These molecules typically require ATP in order to transport them across the membrane, but this isn’t always necessary. Number of Words: 0 words written. Bullet Points: __ __, __ __, __ __, __ __. Chapter 31: Introduction to Membranes and Bioenergetics (Page 132) Contrary to what people often think, the membrane is not a barrier. There are certain molecules that can cross it and enter into an adjacent compartment or leave altogether. These molecules typically require ATP in order to transport them across the membrane, but this isn’t always necessary. This chapter will cover two main topics: membranes and bioenergetics of living organisms. Of these two subjects, one involves getting energy from food; while the other provides structural support for cells so that they can continue functioning properly with all their organelles inside—allowing life to happen as we know it. __ __

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