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nordsb [41]
3 years ago
9

the cell membrane is a highly selective barrier that controls the movement of substances in and out of the cell. In fact, polar

molecules are unable to go across unless
Biology
2 answers:
ValentinkaMS [17]3 years ago
4 0

Answer:

Polar molecules are unable to go across unless they are crossed with the help of the protein channel.

Due to the semi-permeable nature of the plasma membrane polar molecules and molecules with high molecular weight are unable to cross the membrane.

Their transportation across the cell membrane is facilitated by integral transmembrane proteins or carrier proteins which form channels across the membrane.

For example, fructose in the small intestine is transported into the cell with the help of GLUT5 transporter.

snow_tiger [21]3 years ago
4 0

they pass through channels in the cell membrane

Further Explanation:

Membranes of different organisms are rich in lipids, a bio molecule, which is hydrophobic in nature. Due to this reason, amino acids which are hydrophobic in nature will become part of proteins, residing on the external surface of the membrane, so that they can interact with the membrane through hydrophobic interactions. Hydrophobic amino acids, such as leucine and phenylalanine interact with hydrophobic phospholipid and help in holding the protein together.  

And the amino acids, which are having charged side chains will become part of the proteins, present inside the cell.A trans membrane pump (transporter protein) is associated with membrane. It helps in the movement of nutrients from one side to another by some components of cells, such as vesicles. It carries out a facilitated diffusion process.

Learn More:

  1. Learn more about the fibrous skeleton of the heart <u>brainly.com/question/7301375 </u>
  2. Learn more about blood cells bring oxygen and take carbon dioxide away <u>brainly.com/question/1213217 </u>
  3. Learn more about the system prepares food for absorption into the bloodstream <u>brainly.com/question/310282 </u>

Answer Details:

Grade: High School

Subject: Biology

Chapter: Cell Biology

Keywords:

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Radda [10]

Answer:

A: Esophagus

Explanation:

Hopefully this helps!

8 0
3 years ago
A scientist observes that, when the pH of the environment surrounding an enzyme is changed, the rate the enzyme catalyzes a reac
vredina [299]

Answer:

A- A pH change can cause the enzyme to change its shape

Explanation:

A rise or fall in the pH of the medium from the optimum of pH 7 usually affect  the  enzymes' active sites  of  and therefore the  shape and  the  rate of enzyme activity.

Assuming  the pH is too low, the enzyme medium becomes acidic;Acidosis. The high Hydrogen ions concentration  interacts with the R-groups of the amino acids moiety of the enzymes, this interaction affects the ionization of the  R-groups, disrupting the ionic bonding holding these R-groups in shape.

This results in loss of the 3-Dimensional shape arrangements of the protein molecule  and therefore of the active sites. Since active sites of  enzymes  determines the specificity of the <u>enzymes substrate- complex </u> to give <u>enzyme-product complex,</u> the catalytic activity of the enzymes decreases, <u>the rate of  reaction decreases,and products formation stops, and the reaction also stops.</u>

The same is applicable to extremely high pH=Alkalosis.

However, the effective buffer system of the body prevents this scenarios from happening in real sense in the body. Through mopping by the  haemoglobin, excretion by the kidney, etc

7 0
3 years ago
Do animals have more traits in common as adults, or as developing embryos? Explain your<br> answer.
Lerok [7]

Answer:

they do have a lot of traits in common as adult.

8 0
2 years ago
The study of the similarities and differences in the embryos of different species
grin007 [14]

yes they are quit different in some things


5 0
2 years ago
4 Suggest how being an annual plant helps a weed to live in its habitat.
kobusy [5.1K]

Answer:

Answer is on the pic

Explanation:

I hope it's helpful!

5 0
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