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.

4,269 Questions
Microbiology
Cell Biology (cytology)
Cell or Plasma Membranes

Why is the cell membrane not permeable?

Baculoviruses are arthropod-specific viruses containing large double-stranded circular DNA genomes of 80,000–180,000 bp. In recent years, they have been utilized for producing complex eukaryotic proteins in insect cell cultures.

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Cell or Plasma Membranes

Do cell membranes make nutrients for cells?

That is not one of their even-minor numerous functions.

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History of Science
Genetics
Cell Biology (cytology)
Cell or Plasma Membranes

How was the cell discovered?

by a microscope by Robert Hooke

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Biology
Cell or Plasma Membranes

How does a plasma membrane determine selectivity of molecules?

Plasma membrane possesses specific protein channels and lipid bilayer. Protein channels are of million different types, each allow a specific molecule to pass through it regarding its size, shape, charges on it, solubility, etc. Fat soluble molecules pass through lipid bilayer.

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Cell or Plasma Membranes

What is A lipid found in animal cell membranes that reduces permeability and stiffens up the membrane?

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Cell or Plasma Membranes

What is the function of the plasma membrane?

sex me up bicthes

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Cell or Plasma Membranes

Cell membranes are mainly composed of?

lipid bi layer and protein. the composition cell membrane is verified by fluid mosaic model.

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Biology
Genetics
Cell or Plasma Membranes

What happens when the cell membrane or plasma membrane ruptures or breaks down?

On providing a hypotonic environment outside the cell, the plasma membrane bursts.

When the cell membrane ruptures, the cellular contents are released to the environment as the cell membrane is the 'wall' that separates the cellular contents from the outer environment. In biological terminology, this is called cellular lysis.

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History of Science
Cell Biology (cytology)
Cell or Plasma Membranes

What happens when you don't have a cell membrane?

Then there is nothing to contain the organelles and cytoplasm within the cell. Without the membrane the cell can't survive.

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Genetics
Cell Biology (cytology)
Cell or Plasma Membranes

What is a partially permeable barrier which controls the passage of substances into and out of the cell?

cell membrane

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Cell or Plasma Membranes

In a plasma membrane how do the tails of the phospholipid molecules line up?

they are sandwiched between two layers of heads

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Shotguns
Springfield Firearms
Cell or Plasma Membranes

How do you re-assemble a Springfield Model 67C shotgun?

type in your query at google.com Really is the best search engine!

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Cell or Plasma Membranes

A double layer of these molecules make up the plasma membrane?

phospholipids

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Microbiology
Cell Biology (cytology)
Cell or Plasma Membranes

Can sperm cross the hymen membrane?

Yes, it's a fact. It's not common, but you could be a virgin and be pregnant.

Yes, if any semen "leaked in" her vaginal opening, there is a chance she could become pregnant. Also, not all female virgins have a hymen, either due to genetics, injury, or athletic workouts. If she doesn't get her period, she should wait 1-2 weeks and take a pregnancy test.

Yes, because there is normally a opening in the hymen of a girl to release the mentrual blood. Through this opening the semen can come into the vagina.

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Cell or Plasma Membranes

Plasma membrane is a organelle?

yes, just like skin is an organ

107108109
Cell Biology (cytology)
Cell or Plasma Membranes

What does the cell membrane do in the nerve cell?

Its main function is to propagate the nerve impulse along the length of the axon.

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Cell or Plasma Membranes

Is cholesterol harmful to the plasma membrane?

no

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Genetics
Cell or Plasma Membranes

What does plasma membrane do in an animal cell?

plasma membrane in animal cell have many functions which r under:

1-it protects the cell from outside any activity.

2-it give shape to the cell.

3-its main function is to transport food particles nd water nd fluid to inside nd outside the cell.

4-it give support nd frame work to the cell.

5-many orgenells r bounded with cell membrane or plasma membrane during invagination process.

6-it maintains osmotic pressure,turgor pressure,water potential nd maintain the environment of the cell .

7-it works during exocytosis nd endocytosis.

8-it works during hypotonic nd hypertonic environment.

101102103
Biology
Genetics
Cell or Plasma Membranes

Factors affecting permeability of the plasma membrane?

The size, charge, hydrophobicity and polarity of the molecule to permeate the membrane.

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Cell or Plasma Membranes

What does the cell membrane do for a cell?

stores food water and wastes

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History of Science
Cell Biology (cytology)
Cell or Plasma Membranes

Who discovered cells?

Scientist Robert Hooke discovered cells in 1665. While observing a thin slice of cork under microscope he saw several pores that were separated by walls surrounding each of them. Hooke named them 'cell'. As cork bears dead cells he could not give any description about nucleus or cytoplasm.

The term cell was first coined by Robert Hooke in 1665. However it was Antonie van Leeuwenhoek who saw the first living cells, which he called animalcules, in 1674.

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Microbiology
Genetics
Cell Biology (cytology)
Cell or Plasma Membranes

What is an analogy for a cell membrane?

Many textbooks will compare a cell membrane to the fluid mosaic model, which means that the parts of the membrane (phospholipids, cholesterol, proteins etc.) are not stuck in one place; they move around and can pass by one another while still keeping the integrity of the membrane. That is mainly for the structure, but structure always lends to function.

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Cell or Plasma Membranes

Are cell membranes dependent on other organelles?

The cell wall is like a "shelf" for the cell membrane.

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Cell or Plasma Membranes

How does ethanol affect cell membranes?

Ethanol is a solvent so will affect the permebility of the cell. It will break down the phospholipid bilayer and will denature the protein by breakin the hydrogen bonds,

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Domestic Dogs
Genetics
Cell or Plasma Membranes

How many different kind of bases can be found on DNA?

four:which are

adenine
thynime
guanine
cytosine

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