A diploid cell, with a chromosome charge of 2n = 2 will have in:
<em>G1 = 4 strands of DNA, two for each DNA molecule.
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<em>G2 = 8 strands of DNA.
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<em>Prophase I = 8 strands of DNA.
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<em>Telophase II = 2 DNA strands per nucleus.</em>
Explanation:
The cell cycle is divided, broadly speaking, into interphase and cell division (M). The process of division -by mitosis or meiosis- involves a series of intermediate steps that conclude with the production of two identical cells (diploid) or two cells with half the chromosome load (haploid), respectively.
<em>In the </em><em>G1 phase</em><em> the cell is in interphase, so the nuclear DNA has not yet replicated. For a cell with 2n = 2, its nucleus has four strands of DNA.
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<em>In </em><em>G2 phase</em><em>, after DNA replication, the number of DNA strands is doubled, so now in the cell nucleus of the cell there are 4 DNA molecules, each with double strands, so there is a total of 8 DNA strands.
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<em>In </em><em>prophase I </em><em>of mitosis or meiosis the cell still does not divide there are 4 DNA molecules and 8 DNA strands, as in the previous step.
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<em>In </em><em>telophase II</em><em>, which only occurs in meiosis, the chromosome charge has been halved, so each daughter cell will have one chromosome (n = 1), one single DNA molecule and 2 DNA strands per nucleus.</em>
True. A protein becomes functional only when it reaches its tertiary shape (3D). It is not necessary for the protein to reach the quaternary stage, but that is just a more complex functioning protein. It really is just two tertiary merged together. Example is red blood cells.
A change in the DNA sequence of a gene leads to a change in the nucleotide sequence in the messenger RNA, which can lead to a change in the amino acid sequence of the resulting protein.
