[Solved] Which of the following statements concerning the citric acid cycle as the central metabolic pathway is true ? A) It is involved in the metabolism of sugars and amino acids. B) It is involved in the metabolism of amino acids and lipids. C) It links anaerobic metabolism to aerobic metabolism. D) Many of its intermediates are starting points for synthesis of a variety of compounds. E) All of these are reasons why the citric acid cycle is considered to be the central pathway. Micrographs: Photographic or digital images taken using a microscope to magnify objects that are too small to be seen by the naked eye. Megakaryocyte: A large bone marrow cell responsible for the production of blood thrombocytes (platelets), which are necessary for blood clotting. Monocyte: A monocyte is a type of white blood cell part of the human body's immune system that fights off viruses, bacteria, and fungi; these cells can differentiate into macrophages and dendritic cells. Hematocrit Value: The proportion of blood volume that is occupied by red blood cells, expressed as a percentage.