A mature active cell in a healthy human has the following features:

• a cell membrane
• no nuclear DNA
• molecules that bind with oxygen.
  Which of the following statements about this cell is/are correct?
  1 It is transported by a solution.
  2 It releases oxygen into active tissues.
  3 It releases energy from its own mitochondria.

Answer:

9) E

The mature, active cell in question is a red blood cell.
A red blood cell has a cell membrane, no nucleus (hence no nuclear DNA) and has molecules that bind with oxygen (haemoglobin).
1 – correct. Red blood cells are transported in blood which is a solution of plasma, white blood cells and red blood cells.
2- correct. Red blood cells’ function is to transport oxygen around the body to active tissues.
3- wrong. Red blood cells do not have organelles and hence, no mitochondria.