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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
Are phospholipids found in the cell membranes of animal cells?
yes, they are orgranized in the bilayer of the plasma membrane.
What is a monera's cell membrane composed of?
Monera's cell is a prokaryotic cell i.e. it is composed of everything that a eukaryotic cell but without a nucleous.
Which is an example of how the cell membrane of a tube worm maintained a stable environment?
Some examples of how the cell membrane of a tube worm maintains a stable environments are that:
- It prevents minerals in the water from flowing into the cell.
- It prevents salt from flowing in.
What is the general term for all cellular contents between the plasma membrane and the nucleus?
Well there is the cytoplasm which is a chemical substance that holds a protein carrying substance called Ribosomes.
There is lots more cellular machinery inside the plasma membrane.
Golgi apparatus ( there like packing plants of the cell)
mitochondria (the power house of the cell)
endoplasmic reticulum ( there are 2 kinds: rough ER which is for transport and protein synthesis, and smooth ER which which transports carbohydrates)
secretory vesicles (a sac that the Golgi uses for secretion)
Lysosome (breaks down lipids, nuclear acid and phospholipids.)
all of the cellular contents together would be called cellular machinery.
Hope that helped!
What is an example of active transport through a cell membrane?
Osmosis. Osmosis is the diffusion of water through a selectively permeable membrane. I'm assuming you mean active transport of plasma into a red blood cell.
Which cell organelle synthesizes the lipids that make up the bulk of cell membranes?
The cell membrane is a lipid bilayer, composed of phopholipids: A glyerol molecule with two fatty-acid groups at one end and a phosphate group at the other.Phospholipids are synthesised in the cytoplasm next to the endoplasmic reticulum. The ER sythesthies the lipids, and contains enzymes that catalyse the production of phopholipids such as Glycerol-3-phosphate acyltransferase.
The phospholipids produced migrate naturally to the internal face of the membrane, and flippase moves them to the outer face.
What is the cell membrane like in real life?
People live in towns.
People are multicellular organisms consisting of trillions of cells.
Each cell has a cell membrane.
Why does water require channels to be transported across the membranes?
Water doesn't require channels to be transported across membranes because water is small enough to slip past the membrane; however, some cells do have channels, called aquaporins, which greatly increase the rate that water passes through the membrane.
Do substances enter any plant or animal cell by passing through a cell membrane?
Molecules can not pass through the cell membrane, because endocytosis is important for those large molecules that can not pass through the cell membrane!!
The primary function of the thymus is the processing and maturation of special lymphocytes (white blood cells) called T-lymphocytes or T-cells, which are associated with antibody production. T-lymphocytes migrate from the bone marrow to the thymus, where they mature and differentiate until activated.
in short the thymocytes present in the thymus produces the T lymphocytes
Can proteins pass through transport proteins?
No the soluble proteins can not pass though the transporters on the membrane. Transport proteins are highly specific they only allow the transport of ions such as Na or K across the cell. But transport proteins such as Hemoglobin can carry oxygen or CO2 to all the tissues for respiration.
Which molecule is primarily responsible for the differntiation of cells?
transcription factor proteins.
When a Neuron is resting is the inside and outside of the cell membrane positive or negative?
A neuron wouldn't be at rest if it had positive membrane potential. It would fire an action potential. If the neuron remained depolarized then it will fire controllably, and nearby cells are then at risk of being overstimulated. If this activity spreads far enough then it will lead to an epileptic seizure - which is also damaging to neurons.
What components of the plasma membrane is described by the fluid mosaic model?
embedded in a lipid bilayer
How does the cell transport water across the membrane?
The question is not very clear.
Each cell is surrounded by a cell membrane. This cell membrane acts as a protective cover.
The cell membrane allows only small molecules (water) to enter and exit the cell. It does not allow larger molecules to enter.
How does oxygen get in and out of plasma membrane?
Oxygen, O2, is a small enough molecule that it diffuses diwn it's concentration gradient into the cell and rather easily foes through the plasma membrane. Many small molecules can do this.
What are the factors that damage a membrane?
If you are referring to cellular membrane, different types of injury vary according to the cell type. Some typical examples of agents that may cause damage to cellular membrane in people are:
Toxic drugs, solvents & metals; oxidative stress; gastric acid; cigarette smoke; autoimmune damage; excessive hormonal activity; physical trauma; heat/cold; too little or too many dietary elements; radiation; viruses; bacteria; parasites; fungi.
Cell membranes that allow certain molecules to pass through while keeping others out are called?
semi permiable I believe, but I'm not 100 percent sure on the spelling
selectively permeable
What helps hydrophobic get through the cell membrane?
Cannot not find the specific answer but it is one of these...
A. By passive transport directly across the membrane
B. by active transport directly across the membrane
C. through integral transport proteins
What material is within the cell membraine that is not part of the nucleus?
Protoplasm/Cytoplasm
Ribosomes
Mitochondria
What is the purpose of cholesterol in a membrane?
Cholesterol helps stabilize the membrane at warm temperatures, but also helps keep the membrane fluid at lower temperatures.
Which part of a cell allows nutrients and other materials to enter or leave the cell?
Transport proteins allow nutrients to enter and leave cells. Transport proteins are peppered throughout the cell membrane. Most molecules need the transport proteins to enter or leave the cell, but it's possible for some molecules, like water, to diffuse through the membrane by osmosis.
What are an animal cells waste products?
An animal cells waste products are carbon dioxide from cellular respiration and urea which is removed from the blood by the kidneys, stored in the bladder before being excreted.
Which is correct regarding diffusion?
It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration
