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What is it called when a cell membrane closes around a molecule to allow the molecule to enter the cell?
selectively permiable membrane (you might want to double check that though...)
Is the case when a molecule causes the cell membrane to bulge inward forming a vesicle. Exocytosis Endocytosis Passive transport none of the above?
Endocytosis is the process where a molecule causes the cell membrane to bulge inward, forming a vesicle to bring the molecule inside the cell. This is distinct from exocytosis, which is the process of releasing molecules from a cell by fusing vesicles with the cell membrane and expelling their contents.
Do water molecules passively enter and leave cells through the plasma membrane?
Yes, water molecules can passively enter and leave cells through the plasma membrane via a process called osmosis. Osmosis is the movement of water across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration to maintain equilibrium.
What part of the membrane would help a large protein molecule enter the cell?
Globular Proteins
What process moves water out of a cell?
Osmosis is the process that moves water out of a cell, where water molecules move from an area of higher concentration to lower concentration across a selectively permeable membrane. This helps maintain the cell's internal environment and prevent it from bursting due to excess water intake.
Which type of molecule can move passively across the membrane?
Small and non-polar molecules, such as oxygen and carbon dioxide, can move passively across the membrane through simple diffusion. This process does not require energy and occurs in the direction of the concentration gradient, from an area of higher concentration to lower concentration.
When hydrostatic pressure forces water across a membrane passively the process is called?
It's called Filtration
Oxygen crosses the plasma membrane by?
simple diffusion. Oxygen is a small, nonpolar molecule that can pass freely through the lipid bilayer of the plasma membrane. This process does not require energy and is driven by the concentration gradient of oxygen on either side of the membrane.
How would a polar molecule like water travel through the plasma membrane?
The structure of cell membrane allows nonpolar molecules to diffuse, but not polar molecules. Membrane architecture is in the form of a phospholipid bilayer. A single phospholipid has a "head" composed of a polar NH3 group, and two "tails" composed of nonpolar fatty acids. The lipids spontaneously arrange themselves into bilayers with the hydrophilic heads directed outward, and the hydrophobic tails facing inward. Because nonpolar solvents can only dissolve nonpolar solutes, polar molecules cannot mix with the nonpolar inside of the lipid bilayer. A polar molecule cannot cross the cell's lipid membrane without aid from a carrier protein. While this is true, there are multiple forces that dictate whether or not a molecule can cross a phospholipid membrane, including electrochemical gradients and size. Very small and non-polar molecules have a very easy time crossing the phospholipid bilayer. However, very small, polar molecules like water can also cross the phospholipid bilayer due to hydrostatic pressure and concentration gradient differences. Water will, but with some difficulty because of it's polarity. Aquaporins, protein channels embedded into cellular membranes allow for sufficient amounts of water to diffuse into cells.
What process requires energy to bring molecule across the cell membrane?
active transport
What is it called when a cell membrane closes around a molecule to allow the molecule to enter the cell?
selectively permiable membrane (you might want to double check that though...)
Is the case when a molecule causes the cell membrane to bulge inward forming a vesicle. Exocytosis Endocytosis Passive transport none of the above?
Endocytosis is the process where a molecule causes the cell membrane to bulge inward, forming a vesicle to bring the molecule inside the cell. This is distinct from exocytosis, which is the process of releasing molecules from a cell by fusing vesicles with the cell membrane and expelling their contents.
In which process does a portion of the cell membrane fold inward and surround molecule to bring them into the cell?
ENDOCYTOSIS
Do water molecules passively enter and leave cells through the plasma membrane?
Yes, water molecules can passively enter and leave cells through the plasma membrane via a process called osmosis. Osmosis is the movement of water across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration to maintain equilibrium.
Is when extensions of the plasma membrane surround a macro-molecule?
That is called endocytosis, specifically phagocytosis when the macro-molecule is a solid particle or pinocytosis when it is a liquid. In this process, the plasma membrane surrounds the molecule to form a vesicle, which then enters the cell.
What is the process by which substances are moved through the cell membrane by a carrier molecule?
facilitated diffusion or active transport
When molecule cause cell membrane to bulge inward forming a vesicle it is undergoings?
This process is called endocytosis.
