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Daniel [21]
4 years ago
14

What is cell membrane

Biology
2 answers:
sdas [7]4 years ago
8 0

Answer: Cell membrane is layer which is present in all living cells. It is present under the cell wall but in some cases such as plant cells.

Explanation: It is composed of lipid bilayer and proteins embedded in it. Phospholipids, glycolipids and sterols is the composition. Its function is to protect the cell from extracellular environment. It is semipermeable membrane that js allow only selected molecules to pass.

liubo4ka [24]4 years ago
4 0

Answer: A cell membrane is a phospholipid bilayer that defines the external boundaries of cells and regulate the molecular traffic across the boundary.

Explanation: Cell membranes are flexible, self-sealing and selectively permeable bilayer of phospholipids with proteins embedded in the bilayer through hydrophobic interactions. Cell membranes are formed by the interactions of the hydrophobic tails of the phospholipids, the hydrophobic tails of the phospholipids face each other while their polar head groups face outward, thus forming a bilayer with a fluid hydrophobic core. The selective permeability of membranes makes them to retain certain compounds and ions within cells while excluding others. Cell membranes include an array of proteins specialized for promoting or catalyzing various cellular processes such as synthesis of lipids and certain proteins and the energy transductions in mitochondria and chloroplasts.

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The answer is <span>To become specialized, cells need to control the production of proteins coded for in their DNA.

All genetic information in a cell's DNA is not fully expressed at all times. On the contrary, in different cell lines, different DNA segments are expressed at different times. Some genes are active in unspecialized cells and later deactivate, some are activated only in specialized cells, for example. These are facultative genes which are active when needed, unlike constitutive genes which are expressed continually. Therefore, <u>t</u></span><span><u>o become specialized, cells need to control the production of proteins coded for in their DNA. </u>DNA segments, however, remain in cell and are not destroyed. Also, during the mitosis, all genes are passed, not only required genes.</span>
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3 years ago
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(Put in own words this is from online hope it helps)

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3 years ago
The churning air in the troposphere helps determine the ___ of a place
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4 years ago
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3 years ago
10. A body is found at 2:00 pm on New Year's Eve. The temperature of the liver registers 75.5° F. What is the
EastWind [94]

Given what we know about the correlation between the liver temperature of a corpse and the estimated TOD, we can conclude that the estimated time of death is approximately 10:30 pm of the night before.

<h3>How do we estimate the TOD?</h3>
  • This can be achieved using a mathematical formula.
  • The formula in question involves taking the normal body temperature of a living human and subtracting the liver temperature of the body.
  • The remaining is the difference in temperature.
  • Given that a body will lose roughly 1.5 degrees worth of heat per hour, we divide the remaining number by this to get the amount of hours since the death.
  • This leads us to the conclusion that this individual perished roughly 15.5 hours earlier.

Therefore, given the way in which we use the correlation between liver temperature and time to analyze and approximate a time of death, we can confirm that this individual will have perished at roughly 10:30 pm of the night before.

To learn more about body temperature visit:

brainly.com/question/13711359?referrer=searchResults

8 0
2 years ago
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