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sukhopar [10]
3 years ago
14

Which of the following is NOT an example of a pre-zygotic barrier?

Biology
1 answer:
EastWind [94]3 years ago
6 0

Answer:

isolating mechanisms The reproductive characteristics which prevent species from fusing. Individuals mate in their preferred habitat, and therefore do not meet individuals of other Genomic incompatibility, hybrid inevitability or sterility. show that there is little behavioural, mechanical, or post-mating isolation

Explanation:

i hope all help full

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1) There is a larger number of hydrophilic molecules on the outside of a cell than on the inside. Identify the conditions that c
spin [16.1K]

Answer:

<h2>C. placing carrier proteins in the membrane.</h2>

Explanation:

If there is no barrier preventing molecules from moving molecules, then there will be large movement of molecules  from an area of high concentration to an area of low concentration. This passive process is known as diffusion. The phospholipid bilayer of a cell's membrane works as a barrier to large molecules, ions, and most hydrophilic molecules. Whereas small hydrophobic molecules can pass freely through the phospholipid bilayer, other molecules and ions are transported across the cell membrane with the help of transport proteins. Some transport proteins, allowing hydrophilic molecules and ions to passively move through them and across the cell membrane.

Examples: carrier proteins and channel proteins.

Placing carrier proteins in the cell membrane will allow the molecule to reach equal concentrations on the both the sides of the membrane and maintain that way over long time. In contrast, transport proteins known as pumps will use cellular energy, usually in the form of ATP, to transport molecules.

Placing equal numbers of intracellularly directed and extracellularly directed pumps would also equalize the concentrations of a molecule long over time. Pumps are to transport molecules against their concentration gradient, such as the sodium-potassium pump continuously moves sodium ions out of a cell.  

Through the use of carrier proteins, there is equalization of  concentrations of a hydrophilic molecule. This equalize the numbers of molecules on the inside and outside of the cell, but the pumps would continue moving the molecule inward, eventually resulting in more molecules inside of the cell than out.

3 0
3 years ago
Can someone explain this to me?
Anna007 [38]

itd be D. it says producers are at the bottom and plants are producers. sooo

4 0
3 years ago
Read 2 more answers
What is the probability?:
Fittoniya [83]

Answer:

The probability that this couple will have a child with Duchenne Muscular Dystrophy is 50/50

Explanation:

This Punnett square shows our woman as "xx" and our man at "xy". Knowing this, we can now look back at the Punnett square's results. Out of the four squares, two of them are fill with the woman's carried condition, but the other two are also filled with the man's. So, that leaves us with a 50 percent chance that their child will have DMD.

Hope this helped!

Sources: N/A

6 0
3 years ago
How are humans and plants alike when it comes to obtaining energy and growing?
Damm [24]
We breath in oxygen and out carbon dioxide where plants breath in carbon dioxide and out oxygen. that is how we are alike when it comes to energy and like plants it takes time for us to grow.

hope this helps
8 0
3 years ago
What is the SI unit of measure for sound intensity
Alexeev081 [22]
It is the Watt per square meter, or W/m2.
7 0
3 years ago
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