Which codon is the code for the amino acid histidine (His)?
a. AAC
b. CAU
c. UAC
d. CAA

Option B) CAU

Explanation:

The codon is a combination of three nucleotides of either adenine, cytosine, guanine or uracil that joins together to form a triplet code and carried by the messenger RNA (mRNA) molecule.

One of such is CAU (with cytosine, Adenine and uracil nucleotides) present on mRNA molecule and codes for the amino acid named Histidine.

Thus, the codon, CAU will always be translated to add histidine to the polypeptide chain

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

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.