Answer:
undergo irreversible repression
Explanation:
Cellular differentiation refers to the process by which one cell and/or cell population divides and differentiates into more specialized cells. During cell fate differentiation, epigenetic marks modify chromatin structure in order to hamper the accessibility of the transcriptional machinery and transcriptional factors to different genes, which are irreversibly repressed. These epigenetic marks include DNA methylation and histone modifications (e.g., histone acetylation, histone methylation, etc). For example, it has been shown that DNA methylation and histone H3 lysine 27 tri‐methylation (H3K27me3) are epigenetic repressive marks on genomic regions that play a major role in gene expression programs during cell fate differentiation.
Answer:
1. cerebellum
2. brainstem
3. cerebrum
4. cerebrum
5. brainstem
6. cerebrum
7. cerebellum
Explanation:
The cerebellum is a region of the brain located behind the top part of the brainstem, which coordinates voluntary movements (e.g., posture, balance, coordination, speech). The cerebellum is well known to regulate the balance of the body. The brainstem is a type of automatic control center that connects the cerebrum with the spinal cord. The pons represents a group of nerves that serve as connection between the cerebrum and cerebellum. The pons are located in the brainstem (between the midbrain and the<em> medulla oblongata</em>). The cerebrum is the largest part of the brain and can be divided into right and left hemispheres. These hemispheres communicate with each other by the <em>corpus callosum</em>.
Some featured visible in an electron microscope may not be present in the living cell because process involved in preparation alter or distort the cell content.
The most effective sort of microscopes can detect even individual atoms; these are called electron microscopes. However, because the materials are destroyed by the electrons, these microscopes cannot be utilized to observe living cells.
Instead of using light to image specimens, electron microscopes use a particle stream of electrons. Images captured with an electron microscope have resolutions between 0.2 and 10 nanometers, which is 10 to 1,000 times better than that of a conventional light microscope. Additionally, samples can be magnified with an electron microscope up to two million times, compared to 2,000 by a light microscope.
To know more about a microscope, refer to the following link:
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Answer: It is easier to prevent the degradation of old soil than it is to generate new soil.
