Answer:
It indicates that core histone genes were present in the last common ancestor of yeasts, plants, and animals
Explanation:
Histones are highly basic proteins that can strongly interact with DNA, which is packaged into nucleosomes, the basic structural and functional unit of chromatin. Each nucleosome is composed of approximately 147 base pairs of DNA wrapped around a core of eight histone proteins (two copies of four types of histones H3, H4, H2A, H2B). These core histones are evolutionarily conserved across eukaryotic kingdoms in terms of sequence and structure. Therefore, DNA-packaging into nucleosomes is considered a constraint for the evolution of core histones. Moreover, the presence of conserved core histones in eukaryotic kingdoms (e.g., yeast, plant, and animal kingdoms) is strong evidence that histone-mediated DNA packaging was presumably present in the last common ancestor of eukaryotic genomes.
Answer:
D. Sulfur
Explanation:
Electrons are filled in shells. Oxygen has a total of 8 electrons while sulfur has a total of 16 electrons. Out of the total eight electrons, the first shell has two electrons while six electrons are filled in the “s and p” orbits of the second shell giving the outer shell a configuration of "2s2, 2p4".
Likewise, out of the total 16 electrons of sulfur, the last 6 electrons are filled in "s" and "p" orbits of the third shell. Sulfur has a total of six electrons in its outer most shell "3s² 3p⁴". Since the electrons present in the outer most shell are available for chemical reactions and determine the chemical nature of the atom, oxygen and sulfur should exhibit the same chemical properties.
Answer:
SON LAS DE LA GRAMA cuales
Explanation:
I DON'T KNOW what to said. (을 금 수 있는 것입니다 수 있는 것은 아니지만)
Acid erosion because when acid erosion hit it dose not hit physically so it’s said erosion
Answer:
Some of her T cells are recognizing and responding to her self antigens.
Explanation:
Rheumatoid arthritis is characterized as an inflammation in the joints. This inflammation is created by some T cells and their associations with antigens.
Right at the initial stage of the disease, T cells are activated by their own antigens, which makes them respond to this activation by recruiting monocytes and creating antibody-producing cells from the B lymphocyte. T cells also cause the release of free radicals and lysosomal enzymes, in addition to promoting an activation of the high imne complex. All of this, attacks the joints causing an inflammatory process at the site, which justifies the autoimmune character of this disease.
Autoimmune diseases are those in which the elements of an organism's immune system attack the healthy cells of the organism itself, as we can see in the paragraph above.
