Which of the following is a CORRECT pairing of the RNA type and the description? 1. TRNA/contains codons which determine the correct amino acid sequence for a protein
2. mRNA/ formed from the DNA gene sequence with the help of RNA polymerase
3. rRNA/formed in the nucleus and carries amino acids to the ribosome 4.mRNA / contains anti-codons which are complements to tRNA codons

2. mRNA/ formed from the DNA gene sequence with the help of RNA polymerase

Explanation:

Ribonucleic acid, commonly known as, RNA, is one of the two nucleic acid biomolecule. Three types of RNA exists with varying functions viz: Transfer RNA (tRNA), ribosomal RNA (rRNA), and messenger RNA (mRNA).

- mRNA is a type of RNA that is formed from the DNA gene sequence during transcription with the help of RNA polymerase. It contains codons which determine the correct amino acid sequence for a protein.

- tRNA is a type of RNA formed in the nucleus, which contains anticodons (complementary to mRNA codons) that recognizes mRNA codons and carries corresponding amino acids to the ribosome.

- rRNA is a type of RNA that makes up bulk of the ribosome (organelles for protein synthesis).

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.

the answer is b. glad to .