The instructions for making proteins come originally from a) rna. b) ribosomes. c) dna. d) amino acids.

The correct answer is C) DNA.

DNA ( deoxyribonucleic acid) is the genetic material of all life forms. It carries information in the form of nucleotide sequences. DNA is transcribed into mRNA ( messanger RNA), which is then translated into specific proteins. mRNA contains sequences in the form of codon ( a triplet code of nitrogenous base for specific amino acid)

As mRNA is transcribed from DNA. Thus, instructions for making proteins originally comes from DNA.

According to the Central Dogma, genetic information is passed in this order-

DNA→ mRNA→ Protein

b.have there own function.

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.