When tRNA matches with the on the mRNA it brings in the corresponding to begin forming the protein.

a) codon b) anticodon

Explanation:

The process of protein formation in a cell is called Translation.

Translation process begin when tRNA enters ribosome. tRNA consist of three nucleotides called anticodon that matches with the codon present in the mRNA. Anticodon in tRNA binds with a specific codon present in mRNA and so results in the addition of amino acids to produce protein chain.

Hence,  tRNA matches with the codon on the mRNA, it brings in the corresponsing anticodon to begin forming the protein.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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