1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
natta225 [31]
2 years ago
15

Describe the structure of the plasma membrane and the various ways in which the plasma membrane permits interaction with the out

side environment
Biology
1 answer:
Oksi-84 [34.3K]2 years ago
4 0
The structure of the plasma membrane;

The plasma membrane is composed of a bilayer of phospholipids. A molecule of phospholipid consists of two fatty acids and a phosphate group attached to a glycerol component. The fatty acid tails represent a hydrophobic region of the molecule, while the glycerol-phosphate head is hydrophilic. The phospholipids are arranged into a bilayer formation with the hydrophilic heads pointing to the outside and the hydrophobic tails pointing toward the inside. The plasma membrane is a barrier to most molecules. In plants, fungi, and bacteria, the membrane deposits cellulose or other polysaccharides on the outside of the membrane to create a cell wall, which it provides support to the cell.
Embedded in the phospholipid bilayer are various proteins and, in animals cells, cholesterol molecules. This mixture of molecules accounts for the fluid mosaic model of the plasma membrane, that is, a highly flexible lipid boundary impregnated with various other molecules.

The interactions of plasma membrane with the outside environment;

The plasma membrane is a selectively permeable membrane. Small molecules, like O2 and CO2, readily diffuse through the membrane. The movement of larger molecules is regulated by proteins in the plasma membrane. There are several kinds of these proteins. Channel proteins provide passage for certain dissolved substances. Transport proteins actively transport substances against a concentration gradient. The glycocalyx, consisting of the oligosaccharides from glycolipids, recognition proteins, and other glycoproteins, provides adhesion or
participates in cell-to-cell interactions. Receptor proteins recognize hormones and transmit their signals to the interior of the cell.
Various substances can be exported into the external environment by exocytosis. In exocytosis, substances are packaged in vesicles that merge with the plasma membrane. Once they merge with the membrane, their contents are released to the outside. In an opposite kind of procedure, food and other substances can be imported by
endocytosis. In endocytosis, the plasma membrane encircles the substance and encloses it in a vesicle.
You might be interested in
A person walks 12 miles in 3.0 hours. <br> What is the average speed of the person during this time?
Alexus [3.1K]

The answer is.......4!!

Explanation: All you have to do is 12/3.0 and you will get four!

4 0
3 years ago
Read 2 more answers
Which type of energy resource is harnessed beneath the Earth’s surface?
GuDViN [60]

Answer:

D geothermal

Geothermal energy is harnessed beneath the Earth's surface.

5 0
3 years ago
Read 2 more answers
A change in direction without a change in speed is called velocity
maks197457 [2]

Velocity can vary as long there is specific direction (displacement)

Speed has no direction therefore change in speed is not necessary the velocity...

Velocity is also in a specified direction

4 0
2 years ago
Please help me!!!!!
GenaCL600 [577]

Answer:

well for me

Explanation:

I think it's the second one

5 0
2 years ago
Read 2 more answers
Gluconeogenesis occurs in the liver due to the action of ________.
Wewaii [24]
I believe it is D) Cortisol
3 0
3 years ago
Other questions:
  • Which term actually applies to a blend of several different complementary hormones that promote the maturation and functional co
    6·1 answer
  • The chart below shows the three main types of plant tissues and associated tissues. mc003-1.jpg Which row (A, B, C, or D) best c
    14·2 answers
  • When an invertebrate reaches the _____ stage, it most likely stops growing and can begin reproduction. beginning growth adult de
    12·2 answers
  • An open-minded scientist does all of the following except
    8·2 answers
  • "The student predicted that the contractile vacuole would contract fewer times in one minute in a solution that had a higher con
    5·1 answer
  • A particular protein (Vac8) found in yeast has this N-terminal sequence, Met-Gly-Ser-Ser-Cys.... The corresponding DNA sequence
    15·1 answer
  • Describe the difference between codominance and incomplete dominance. Give 1 example of each.
    15·1 answer
  • Imprinting disorders do not involve changes in DNA sequence, but only the methylated state of the DNA. Does it seem likely that
    13·1 answer
  • Hi Please help anyone!??! I need help
    15·1 answer
  • How many rounds of mitosis produce 64 daughter cells?(1 point)
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!