Question

Which is not present in chromatin?
1) RNA
2) DNA
3) Histone
4) Lipids​

Answer 1

Answer:

RNA is not present in chromatine

Answer 2

Answer:

RNA is not present in chromatin.

Explanation:

Chromatin

Eukaryotic cells contain a combination of DNA and protein known as chromatin. The main goal is to compress lengthy DNA molecules into denser, more compact shapes. This keeps the strands from tangling and is crucial for strengthening DNA during cell division, avoiding DNA damage, controlling gene expression, and regulating DNA replication. Chromatin helps with appropriate chromosomal segregation during mitosis and meiosis; the distinctive chromosome shapes that are seen during this stage are the consequence of DNA being wound into extremely condensed chromatin.

Histones are the main proteins that makeup chromatin. Two sets of four histone cores (Histone H2A, H2B, H3, and H4) form an octamer that binds to DNA and serves as "anchors" for the DNA strands to the wind. The three layers of chromatin organization are as follows:

• Histone proteins wrap around DNA to create nucleosomes, sometimes known as the "beads on a string" structure (euchromatin).
• Nucleosome arrays in their most compact form are wrapped by several histones into a 30-nanometer fiber (heterochromatin).
• The metaphase chromosome is created by higher-level DNA supercoiling of the 30-nm fiber (during mitosis and meiosis).
• However, a lot of creatures don't adhere to this organizational structure. For instance, compared to most eukaryotic cells, spermatozoa and avian red blood cells have more densely packed chromatin, whereas trypanosomatid protozoa do not condense their chromatin into any discernible chromosomes. Prokaryotic cells organize their DNA in very different ways (the prokaryotic chromosome equivalent is called a genophore and is localized within the nucleoid region).
• The stage of the cell cycle also affects the overall shape of the chromatin network. The chromatin's structural laxity during interphase makes it possible for RNA and DNA polymerases to access the DNA during transcription and replication. The specific genes found in the DNA determine the local chromatin structure during interphase.

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