When cells make protein from amino-acids, they require energy from ATP. It is also necessary to use ATP to link glucose molecules together to form starch or glycogen. Mitochondria: 1  have a double membrane the inner membrane. 2  the outer membrane; 3  have their own DNA this carries the information to make the enzymes;
In this technique, each member of the population has an equal chance of being selected as subject. The entire process of sampling is done in a single step with each subject selected independently of the other members of the population. There are many methods to proceed with simple random sampling. The most primitive and mechanical would be the lottery method. Each member of the population is assigned a unique number.
Stratified and cluster sampling both attempt to deal with problems with simple random sampling. The first problem is that, while a simple random sample may technically be unbiased, it may not be representative. For example, suppose my population comprises two men and two women and a sample of size two is required.