What process breaks glucose down to be used as an energy source?

Cellular respiration is the aerobic process by which living cells break down glucose molecules, release energy, and form molecules of ATP.

1. Glycolysis

The initial breakdown of glucose occurs in the cell cytoplasm. This is an anaerobic reaction of cellular respiration, meaning that it does not require oxygen. Here, in a series of eight individual reactions, a six-carbon glucose molecule is metabolized using two adenosine triphosphate (ATP) molecules to form two three-carbon pyruvate molecules, two H.

Explanation:

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.