Transport Across a Cell Membrane. The cell membrane is one of the great multi-taskers of biology. It provides structure for the cell, protects cytosolic contents from the environment, and allows cells to act as specialized units.
How to Amend the Constitution. Article V of the United States Constitution provides authority and instructions for amending the Constitution. Amendments can be proposed by Congress or by constitutional convention. Congress then decides how to ratify the amendment if approved by Congress or convention.
An amendment to the Constitution is a change that can add to the Constitution or change an older part of it. An amendment can even overturn a previous amendment, as the 21st did to the 18th. There are a few methods to amend the Constitution, but the most common is to pass an amendment through the Congress, on a two-thirds vote. After that, the amendment goes to the states, and if three-quarters of the states pass the amendment, it is considered a part of the Constitution â it has been ratified.