Describe how the lac operon functions, and explain how it permits e. coli to produce the enzymes needed to breakdown lactose when it is present in the bacterium

Explanation:

            Basically, lac operon is an enzyme, and enzymes work in a very well known way called lock key system . This lock key system works pretty simply, imagine the lock as the enzyme, and this lock needs a specific key to open it, thinking about an enzyme, it needs the specific substrate to breakdown the lactose, this enzyme is called lactase, and it's present in some animals and bacterium too. This doesn't only work for lactose, it's the same lock system for every enzyme, all of them need specific substrate to break it down into things that the body can use for many things.

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.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg