Can active transport take place if there is no oxygen?

Yes, but in humans and other organisms that require oxygen to produce energy efficiently, it won't work quite as well. Active transport is called "active" because it requires the energy from cleaving a chemical bond in ATP. read more

Active transport requires ATP, and can take place so long as there is a steady supply of ATP, regardless of whether that ATP was originally generated with or without oxygen. read more

Active transport: Using energy, ions and small molecules may be pumped into or out of a cell, even against a concentration gradient. Endocytosis: material outside the cell can be "engulfed" by the cell membrane, and brought into the cell that way. read more