Understanding that cellulose is NOT digestible by humans, examine the structures of digestible starch and glycogen and make a prediction if you think agarose (the gel-like substance used in Petri dishes and electrophoresis) is or is not digestible.

Cellulose is not digested by humans since we do not have an enzyme so that this polysaccharide can be digested, like agarose, since the unions of these polysaccharides are complex and different from starch or glycogen, this is how these unions they need enzymes that can catalyze them and humans do not have them.

Explanation:

That is why both cellulose and agarose, as they do not have an enzyme that breaks them down, and is not assimilated in the form of monosaccharides, this polysaccharide cannot be digested or metabolized by humans.

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.