When viewed under a light microscope, what visual difference exists between hete

Question

When viewed under a light microscope, what visual difference exists between heterochromatin and euchromatin? Oa. None, both heterochromatin and euchromatin are too small to be Ob. Heterochromatin appears to be located outside of the nucleus, while euchromatin is intranuclear. O C. Heterochromatin appears extremely light, while euchromatin appears dark. Od. Heterochromatin appears extremely dark, while euchromatin appears light. viewed under a light microscope. This action requires the use of an electron microscope

Explanation / Answer

d. Euchromatin appears light in colour.

The lightly packed material is called euchromatin. Though it is lightly packed in the form of DNA, RNA, and protein, it is definitely rich in gene concentration and is usually under active transcription. If you are going to examine eukaryotes and prokaryotes, you will find the presence of euchromatin. Heterochromatin is only found in eukaryotes. When stained and observed under an optical microscope, euchromatin resembles light-colored bands while heterochromatin is dark colored. The standard structure of euchromatin is unfolded, elongated, and only about the size of a 10 nanometer microfibril. This minute chromatin functions in the transcription of DNA to mRNA products. The gene regulatory proteins, including the RNA polymerase complexes, are able to bind with the DNA sequence due to the unfolded structure of the euchromatin. When these substances are already bound, the transcription process begins. The activities of the euchromatin aid in cell survival.

On the other hand, heterochromatin is a tightly packed form of DNA. It is commonly found on the peripheral areas of the nucleus. According to some studies, there are probably two or more states of heterochromatin. Inactive satellite sequences are the main constituents of heterochromatin. The heterochromatin is responsible for gene regulation and protection of chromosomal integrity. These roles are made possible because of the dense DNA packing. When two daughter cells are divided from a single parent cell, heterochromatin is usually inherited, which means that the newly cloned heterochromatin contains the same DNA regions which results in epigenetic inheritance. There may be the occurrence of repression of transcribable materials due to the boundary domains. This occurrence may lead to the development of different levels of gene expression.

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