The answer is kinetic energy
Answer:
D):Cell membrane
The cell membrane is also called selectively permeable membrane for its composition, it is composed of amphipathic lipid, protein and small amount of cholesterol which form a bilayer structure allow only specific substance.
The cell membrane is a thin selectively semi-permeable membrane and act as an outer covering surrounding cell cytoplasm, Proteins and lipids are the major components.
The major lipids are phospholipid, which form a semi-permeable lipid bilayer which have both hydrophilic or water loving head group and hydrophobic or water hating tail group and form bilayer structure.
Hence both group can interact with polar and non polar molecule individually called as amphipathic in nature, Some organelles like nucleus and mitochondria also have its own cell membrane.
The proteins are peripheral, extrinsic and intrinsic type and the function of cell membrane is to protect the cell and maintain the structural integrity of the internal environment of the cell.
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The cell membrane is also called selectively permeable membrane for the sole reason being it is selective in nature.
It forms a physical barrier and as a barrier between the cell and the external environment as it allows only selected necessary molecules to pass through it and at the same time prevents entry of unwanted / unnecessary substances.
It also regulates the entry and exit of molecules into and out of the cell.
The cell membrane permits the entry of vital molecules like
water, oxygen, amino acids and glucose into the cell as they are crucial for various life processes and at the same time metabolic waste products are expelled through the cell membrane.
As frequency goes up, wavelength does down
Light has frequency but no wavelength
Light has wavelength but no frequency
In the Igf-2 allele, which chromosome is imprinted? Which is expressed?
Match the following terms with their descriptions below.
If a cell is fused with another cell, which of the following would be the best example of a trans-mechanism of epigenetic control?
Answer: A gene that is originally silenced in one cell but expressed in the other is silenced in the hybrid.
I hope this helps, Regards.
The trans-mechanism of epigenetic control can result from the fusion of cells, as seen when certain diets in mice alter DNA methylation. An example of gene imprinting, another form of epigenetic control, is seen in the Igf-2 allele where the paternal allele is expressed and the maternal allele is silent.
The fusion of cells can lead to a specific type of epigenetic control, termed trans-mechanism. This process is best exemplified in the case of the pseudoagouti offspring phenomenon in mice. When female mice are fed a specific diet, it alters the methylation processes of their DNA. As a result, a specific region in the agouti gene becomes hypermethylated which in turn leads to an increased proportion of pseudoagouti offspring.
Addressing the second part of your question, in the Igf-2, or the Insulin-like growth factor 2 gene, it is the paternal allele that is usually expressed while the maternal allele is imprinted and silenced. Imprinting is another form of epigenetic control where the activity of a gene is determined based on which parent the allele was inherited from.
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