During the process of protein synthesis, each trna carries one
a) fatty acid.
b) amino acid.
c) nucleotide.
d) nucleic acid.

The correct answer is -

B) amino acid.

Explanation:

Protein synthesis is a two step process, which includes transcription (conversion of DNA to mRNA) and translation (mRNA to protien).

During the process of translation, tRNA (transfer RNA) molecule carries specific amino acid at the ribosome site according to the codon (a sequence of three nucleotides that code for particular amino acid) sequence present in the mRNA (messenger RNA) .

In this way, a chain of amino acid is assembled, giving rise to particular protien.

Thus, option B) is the right answer.

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.