Would you expect biurets solution to change color if you spilled some on your hair?

Answer              Biuret solution is designed to detect the presence of peptide bond in any sample. Chemically it is composed of potassium sodium tartarate mixed with cupric sulfate and sodium hydroxide.  Hair is composed of keratin protein, contain a polypeptide chain in which amino acids are bonded together with help of peptide bond. So keratin will give a positive test for protein.

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.