GG human body bold photography

Iron constitutes hemoglobin and its function is to transport oxygen and CO2. ..

(1) As shown in the figure, the iron reaction element is located in ferritin mRNA, and the basic unit is ribonucleotide. The tRNA it carries is the one that leaves the far left of the ribosome, and the anticodon on it is CCA. According to the principle of base complementary pairing, the codon of glycine is GGU ... As shown in the figure, in ferritin gene, the base sequence of mRNA chain that determines "-gan-se-tian-..." is ggugacugg. According to the principle of base complementary pairing, the base sequence of template chain is …CCACTGACC… and the other chain is … ggtgattgg …

(2) When the concentration of Fe3+ is low, the iron regulatory protein binds to the iron reaction element, but the ribosome cannot bind to one end of ferritin mRNA and move along the mRNA, thus inhibiting the start of translation; When the concentration of Fe3+ is high, the iron regulatory protein loses its binding ability with the iron reaction element due to its binding with Fe3+, and ferritin mRNA can be translated. This regulatory mechanism can not only avoid the toxic effect of Fe3+ on cells (ferritin is a kind of protein that stores excessive Fe3+ in cells), but also reduce the waste of substances and energy in cells.

(3) Codons (iron reaction elements, stop codes, etc.). ) In the base sequence of the mRNA that guides ferritin synthesis, the number of bases of the synthesized ferritin mRNA is much larger than 3n, and the maximum number of water molecules that can be produced during ferritin synthesis = number of amino acids-peptide chain =n- 1.

(4) The codon of tryptophan is UGG, and the codons of leucine are UUA, UUG, CUU, CUC, CUA and CUG, among which UUG, which has the smallest codon difference with tryptophan, can be changed from UGG to UUG, so the base change on the DNA template chain is from C to A. 。

So the answer is: hemoglobin oxygen.

(1) ribonucleotide? GGU？

(2) Initial encoding of ribosome and ferritin mRNA? Fe3+

(3) untranslated base sequences at both ends 3)mRNA (untranslated iron reaction element and termination code) n- 1.

(4)C-G→A-T(G-C→T-A)