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2 years ago

15

el sistema ne/vioso cental esta formado por . A las neuronas y los cordones nervioso . B. El encefalo y la medula espinal C. los

cordones nerviosos y la medula espimal D. la medula espinal y la neurona

1 answer:

dezoksy [38]2 years ago

3 0

Thanks for the free points, can’t help

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Nataliya [291]

Answer:

i would say 2. and 4.

tides are made by the moon..... but the plates under the Earth's suface causes larger waves.

Explanation:

i know it is not 3. but i'm not sure what 1. is.

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2 years ago

One of the grand challenges in biology is understanding how the first cells formed on Earth. Since all cells are bound by a cell

coldgirl [10]

<h2>Answer is option "A"</h2>

Explanation:

Oils and fats, which in science are called lipids, are known as amphipathic molecules. These molecules have two distinct ends to them: a water-loving (hydrophilic) side and a water-fearing (hydrophobic) side. While the hydrophilic sides of a lipid will associate with the water in a solution, the hydrophobic sides of the lipid all cluster together to 'hide' from the water. Lipids therefore cluster together and form spheres where the hydrophobic sides are in the center away from the water while the hydrophilic sides are on the outside, associating with the water.
The ability of the atoms within a group to form hydrogen bonds with the water molecules around them makes them hydrophilic. Oxygen and nitrogen atoms readily form hydrogen bonds with water molecules, so any organic molecules that have oxygen or nitrogen atoms bound to their carbon skeletons will be hydrophilic.
For example, if we take the molecule for cholesterol, we see the OH group on the left is hydrophilic and will form hydrogen bonds with water, while the ring structures, which only consist of hydrogen and carbon atoms, are hydrophobic and will not associate with the water.
There are many different kinds of lipids with different functions. Lets start by examining phospholipids, which compose the cell membranes of animals. They form lipid bilayers, with one set of hydrophilic heads facing the exterior of the cell membrane and the other set facing the interior (as you can see on the diagram on screen). The hydrophobic portions of the lipid bilayer - the lipid tails - face towards one another, which allows them to hide away from the water inside and outside of the cell.
So,the right answer is option A "amphipathic molecules".

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3 years ago

Which scientist are credited for the events described in the development of the cell theory

Talja [164]

Three scientists are credited with the development of cell theory. Matthias Schleiden observed that all plants were made of cells; Theodor Schwann observed that all animals were also made of cells; and Rudolf Virchow observed that cells only come from other cells.

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3 years ago

Viruses need host cells to replicate<br><br> true or false

andreev551 [17]

Viruses depend on the host cells that they infect to reproduce. When found outside of host cells, viruses exist as a protein coat etc.

true.

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3 years ago

What constitutes a scientific name

romanna [79]

What makes a scientific name is that it must consist of a genus and species name.

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2 years ago