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Does the cell membrane have tiny holes that allow materials to pass into and out of the cell?
The cell membrane contains protein channels and transporters that regulate the movement of materials in and out of the cell. These channels and transporters control the passage of specific substances into and out of the cell. The cell membrane itself does not have "tiny holes" but rather selective protein structures that facilitate the transport of molecules.
Which of the following factors does not affect membrane permeability?
The presence of membrane proteins does not directly affect membrane permeability. Membrane proteins mainly play a role in transport, signaling, and cell recognition rather than impacting the permeability of the membrane itself.
Why is the cell membrane said to be a fluid mosaic?
The cell membrane is called a fluid mosaic because it is made up of a fluid phospholipid bilayer with proteins and other molecules interspersed throughout, giving it a mosaic-like appearance. The fluidity of the membrane allows for movement of molecules within it, contributing to its dynamic nature.
What type of the cell contains DNA but no nucleus contains flagella ribosomes cytoplasm and a cell membrane?
This type of cell is a prokaryotic cell, which is typically found in bacteria. Prokaryotic cells have genetic material contained in a region called the nucleoid, rather than a true nucleus. They contain ribosomes for protein synthesis, flagella for movement, cytoplasm to house cellular components, and a cell membrane to regulate what enters and exits the cell.
What is the thin flexible barrier around the cell is called?
Cell wall
What is the opposite of osmosis?
The opposite of osmosis is dialysis, which involves removing waste and excess substances from the blood by passing it through a membrane. In dialysis, solutes move from an area of high concentration to low concentration rather than water moving through a semi-permeable membrane like in osmosis.
Why is it called osmosis rather than diffusion?
Osmosis specifically refers to the movement of water molecules through a semi-permeable membrane, while diffusion is a more general term that applies to the movement of any type of molecule from an area of high concentration to low concentration. Osmosis is a type of diffusion specific to water molecules.
What do you call the movement from the side on a shaft?
The movement from the side on a shaft is called lateral movement or radial movement. This type of movement involves motion across the axis of the shaft, rather than along its length.
What are false facts about the cell membrane?
•also called the plasma membrane or plasmalemma •surrounds all cells •controls the movement of substances in and out of cells. •Largest cellular organelle in animals •contains a wide variety of molecules, Protein lipids •contains the majority of the cell's genetic material •found by Franz Bauer
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 is the membrane called in the grana?
The thylakoid (granum) lipid bilayer shares characteristic features with prokaryotic membranes and the inner chloroplast membrane. Thylakoid membranes are richer in galactolipids rather than phospholipids.
Why is mass movement of mud called flow?
When mud is involved in a mass movement it behaves as a liquid, flowing downhill and looking rather like a muddy flood.
Cyanobacteria lack a memebrane bound what?
Cyanobacteria lack a membrane-bound nucleus. The genetic material in cyanobacteria is not enclosed within a membrane, but rather exists in a region called the nucleoid within the cytoplasm.
Cells that have no organized nucleus and no internal membrane structure are called?
Cells that have no organized nucleus and no internal membrane structures are called prokaryotic cells. These cells are found in bacteria and archaea, and their genetic material is located in the cytoplasm rather than enclosed in a nucleus.
Does the cell membrane have tiny holes that allow materials to pass into and out of the cell?
The cell membrane contains protein channels and transporters that regulate the movement of materials in and out of the cell. These channels and transporters control the passage of specific substances into and out of the cell. The cell membrane itself does not have "tiny holes" but rather selective protein structures that facilitate the transport of molecules.
Differentiate osmosis from diffusion?
Osmosis is the movement of water molecules across a semi-permeable membrane, from an area of low solute concentration to an area of high solute concentration, to equalize the concentration on both sides. Diffusion, on the other hand, is the movement of molecules from an area of high concentration to an area of low concentration, without the need for a membrane.
What do bacteria have instead of a nucleus?
By saying nucleus, we mean that the DNA is contained in a membrane structure, that we call the nuclear membrane. However in prokaryotes (bacteria are examples!) the nucleus is not contained in a membrane structure. On the contrary, the DNA is rather suspended inside the cytoplasm itself in a compact form and is called a nucleoid.
