Answer:
The cell membrane of a living plant cell selectively regulates the passage of substances into and out of the cell (option A).
Explanation:
The plasma membrane in a living plant cell is composed of a double lipid layer that gives it hydrophobic character and acts as a semi-permeable barrier. The partial permeability of the substances allows regulating the passage of substances from and to the interior of the cell.
At the level of the plasma membrane there are several mechanisms and transport to allow the entry of substances needed for the cell or the output of synthesized products or metabolic waste, thus regulating the passage of substance in a selective way.
Regarding the other options:
<em> B. Plasma membranes are composed of lipids, not just carbohydrates and proteins.
</em>
<em> C. Permeability is not for all substances, but is selective.
</em>
<em> D. Plasma membrane is a lipid bilayer, not a double layer of proteins.</em>
Three examples of the second law of thermodynamics are: taking a bath, melting an ice cube and sweating in a crowded room.
The reason for this is that the second law of thermodynamics is exactly "The second law of thermodynamics says that when energy changes from one form to another form, or matter moves freely, entropy (disorder) in a closed system increases. Differences in temperature, pressure, and density tend to even out horizontally after a while." For more info visit the site I got this info from. :)
https://simple.m.wikipedia.org/wiki/Second_law_of_thermodynamics
In RNA, Ribose is the molecule that forms the backbone; as opposed to DNA, in which deoxyribose forms the backbone
Answer:
Nitrogen is used to build DNA, the basis of our life. Simply, life could not function on earth because there would be no way to fix nitrogen from the air. Nitrogen is necessary for all living beings, and only a few bacteria can actually fix it. All animals including human beings cannot survive without proteins.
Explanation:
