Mitochondria are unusual organelles. They act as the power plants of the cell, are surrounded by two membranes, and have their own genome. They also divide independently of the cell in which they reside, meaning mitochondrial replication is not coupled to cell division.itochondria are unusual organelles. They act as the power plants of the cell, are surrounded by two membranes, and have their own genome. They also divide independently of the cell in which they reside, meaning mitochondrial replication is not coupled to cell division.
U.S. immigration law is very complex, and there is much confusion as to how it works. The Immigration and Naturalization Act (INA), the body of law governing current immigration policy, provides for an annual worldwide limit of 675,000 permanent immigrants, with certain exceptions for close family members.
Much of this change has been (and will be) driven by immigration. Nearly 59 million immigrants have arrived in the U.S. in the past 50 years, mostly from Latin America and Asia. Today, a near-record 14% of the countryâs population is foreign born compared with just 5% in 1965. Over the next five decades, the majority of U.S. population growth is projected to be linked to new Asian and Hispanic immigration.