be made up of=consist of 译为“由......组成”可以直接做谓语动词；made up of=consisting of 可以直接用来做定语或状语,译为“由......组成”；make up 译为“组成,构成”；
The United Kingdom is made up of four countries.=The United Kingdom consists of four countries.
The group made up of 10 students is coming to China.=The group consisting of 10 students is coming to China.
10 students make up the group.