Question

Complete oxidation of 1 gm of glucose molecule gives rise to
(a) 68,60,000 cal
(b) 6,86,000 cal
(c) 68,600 cal
(d) 6,800 cal

Answer 1

Hint: Glucose provides energy through oxidation. Energy processes include Glycolysis, TCA cycle, and Electron transport system.

Complete answer:
Complete oxidation of 1 gram of glucose molecule yields 686 kcal, which is equivalent to 686000 calories of energy.
- Cellular respiration is a combination of anabolic and catabolic reactions ( i.e; metabolism) and processes that take place in the cells of organisms to convert chemical energy from oxygen molecules or nutrients in the form of adenosine triphosphate (ATP) , and then release waste products.
- The reactions involved in respiration are catabolic reactions, which break larger molecules to smaller units, releasing energy, in particular in molecular oxygen, are replaced by stronger bonds in the products.
- Respiration is one of the key ways a cell releases the chemical energy
- The overall reactions are a combination of biochemical reactions, where some of them are redox reactions.
- Cellular respiration is a type of combustion reaction that does not resemble one when it occurs in a living cell.
- Amino acids, fats, and sugars are the nutrients that are commonly used by animal and plant cells in respiration.
- The most common oxidizing agent providing most of the chemical energy in this is the molecular oxygen (O₂) and in the end, energy is stored in the form of ATP.
 So, the correct answer is ‘6,86,000 cal’.

Note: From an atom of glucose, two atoms of pyruvic acid are released in total. Therefore 36 ATPs are generated. During the process of Glycolysis 2 ATPs are formed. Therefore during the complete oxidation of glucose, the net ATP yielded is 38. This process is known as aerobic respiration.