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Cell or Plasma Membranes
Every cell has a cell membrane (plasma membrane) that separates the interior of the cell from the outside environment. One of the most important functions of this biological membrane is to protect the cell from outside threats by controlling the movement of substances in and out of the cell.
1,116 Questions
Describe the structure of a cell membrane-?
The out side of all animal cells. because all the plant cells have a cell wall outside them and after the cell wall there is the cell membrane.its is not completely visible by the microscope.
SZK
Why do cell membranes have convolutions?
To increase surface area, allowing greater contact area for 'transport' of nutrients (movement of substances across the membrane).
You are seeing what is called dehydration due to the loss of water in the cells. Adding salt instead of sugar will due the same thing. And salt will actually cause a total loss of water from the cells.
What are the principle components of plasma membrance and membrance surrounding cell organelles?
Phospholipids are the principle component behind plasma membranes and the membranes surrounding cell organelles. They create a hydrophobic (water repellent) boundary that keeps what's needed in and what's not, out.
What has a more vigorous effect on cell membranes acid temperature or alcohol?
Alcohol affects the permeability of the cell membranes. It would have the most vigorous effect.
Why is it important that cell membranes are selectively permeable?
Cell membranes need to be selectively permeable to control what substances enter and exit the cell. This helps maintain the cell's internal environment and regulate processes like nutrient uptake and waste removal. Without this selectivity, the cell could not function properly and might be susceptible to damage or malfunction.
How does nitric oxide cross the plasma membrane?
Nitric oxide can diffuse freely across the plasma membrane due to its small size and lipophilic nature. It does not require a specific transporter or receptor for entry into cells.
How do the plasma membranes of Archaea differ from the plasma membranes of Eukarya?
In eukaryotes there are ester bonds between hydrocarbons.In archea there ether bonds.
How the function of the protein free membranes would differ from regular cell membranes?
It means nothing would be able to get through, mainly because all the proteins control the passage and what goes through, if there isn't any protein then the cell will be dead.
What does the cell membrane do unlike the cell wall?
the cell wall is only on a plant cell while the cell membrane is on both plant and animal.
The Cell Membrane is made up of a bilayer (double layer) of Phospholipids. These Phosophlipids are oriented by its hydrophobic (water fearing) tails while its head are hydrophilic (water loving).
Which of these neurotransmitters does not bind to a plasma membrane receptor?
Nitric oxide does not bind to a plasma membrane receptor.
Why do cells have membranes with many convolutions?
Cell membranes have many convolutions because they increasee the surface area to volume ratio, thus increasing the diffusion rate.
Which feature enables the nucleus to send and receive information through the nuclear membrain?
Pores enable the nucleus to send and receive information through the nuclear membrane.
Are cell membrane and cytoplasm are organelles of human cells?
The cell membrane is an organelle, but cytoplasm is not an organelle, it is just a substance.
Why can steroids easily cross the membrane but not glucose and water molcues?
Most steroids are apolar whereas water and glucose are not.
What is the function of glycolipid in the plasma membrane?
They act as receptors.They are important in identifications.
Is it eukary cells or porkaryotic cells that surrounded by a cell membrane?
Eukaryotic cells have a membrane
C. A mitochondrion. Prokaryotes do not have mitochondria, which are membrane-bound organelles found in eukaryotic cells that are responsible for producing energy in the form of ATP.
