What do channel proteins aquaporins and carrier proteins have in common See section 5.2 page?
What do channel proteins, aquaporins, and carrier proteins have in common? - They all transport molecules up the concentration gradient.
When can a cell transport a molecule across the phospholipid bilayer of the cell membrane without expending energy such as ATP )?
When can a cell transport a molecules across the cell membrane without expending energy? When the molecule is more concentrated outside the cell.
In which direction is water most likely to move if there is a membrane and if there is a concentration difference between two regions?
Which direction is water most likely to move if there is a membrane or concentration difference between two regions? Water will move out of a hypotonic solution into a hypertonic solution (Water is more likely to move from low solute concentration to high solute concentration.)
In what process does a cell capture large particles in vesicles and bring them into the cell?
EndocytosisEndocytosis definition and purposes. Endocytosis is the process by which cells take in substances from outside of the cell by engulfing them in a vesicle. These can include things like nutrients to support the cell or pathogens that immune cells engulf and destroy.
In what situation does the cell get larger?
The cell gets larger when there are less solute particles. In what situation does the cell get smaller? The cell gets smaller when more solvent particles are added.
Why can't small molecular weight material such as ions pass through the cell membrane what keeps them from entering the spaces of the plasma membrane?
While some polar molecules connect easily with the outside of a cell, they cannot readily pass through the lipid core of the plasma membrane. Additionally, while small ions could easily slip through the spaces in the mosaic of the membrane, their charge prevents them from doing so.
What is the difference between osmosis and diffusion Brainly?
In diffusion, particles move from an area of higher concentration to one of lower concentration until equilibrium is reached. In osmosis, a semipermeable membrane is present, so only the solvent molecules are free to move to equalize concentration.
Why is no energy required in passive transport?
Why is no energy required in passive transport? The membrane physically moves the molecules. Transport proteins move the molecules, so no energy is required.
What is the opposite of active transport?
The movement of substances in passive transport is in the direction opposite to that of active transport. In the active transport, substances (e.g. ions, glucose, and amino acids) move across a membrane from a region of their lower concentration to a region of their higher concentration.
What type of transport occurs when a large cell consumes a smaller cell such as a bacterium?
Phagocytosis (literally, “cell eating”) is a form of endocytosis in which large particles, such as cells or cellular debris, are transported into the cell.
Which of the following best explains why a hypertonic solution causes a cell to shrink?
When a cell is placed in a solution that is hypertonic to it, water will flow from the hypotonic inside of the cell to the hypertonic environment outside the cell. This causes the cell to shrink from water lost and die.
How do cells transport large molecules?
It is possible for large molecules to enter a cell by a process called endocytosis, where a small piece of the cell membrane wraps around the particle and is brought into the cell. If the particle is solid, endocytosis is also called phagocytosis. If fluid droplets are taken in, the processes is called pinocytosis.
Under what circumstances does membrane transport require energy?
When a molecule moves down its concentration gradient is it participating in passive transport; moving up the concentration gradient requires energy making it active transport.
Does passive transport require ATP?
In passive transport, substances (e.g. ions and solutes) move across a membrane from a region of their higher concentration to a region of their lower concentration. The movement is described as downhill. Because of this, cellular energy (e.g. ATP) is not required as it is in active transport.
Does active transport require ATP?
During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.
Why does active transport of molecules across a membrane require ATP?
To move substances against a concentration or electrochemical gradient, a cell must use energy. Active transport mechanisms do just this, expending energy (often in the form of ATP) to maintain the right concentrations of ions and molecules in living cells.
What happens when a vesicle fuses with the plasma membrane?
a vesicle inside the cell fuses with the plasma membrane and releases its contents outside the cell.
What does "larger" mean in biology?
e. a cell that large wouldn't have enough volume to conduct chemical reactions. (a) - the larger the cell, the more nutrients it needs to pull in and the more waste in needs to expel. the volume outgrows the available surface area quickly -.
How does the plasma membrane move?
a form of passive transport. molecules move across the plasma membrane by crossing the lipid bilayer. requires energy from the cell. molecules move against their concentration gradient.
What happens when a cell is too large?
The larger the cell, the more nutrients it needs to pull in and the more waste in needs to expel. The volume outgrows the available surface area quickly.
What is a strong attachment between two cells?
Desmosomes are a strong attachment between two cells.
How does water cross the plasma membrane?
Water can cross the plasma membrane through the process of facilitated diffusion. However, water molecules can also cross the lipid bilayer directly. The sodium-potassium pump uses energy from ATP to move sodium ions out of the cell, and potassium ions into the cell. This is an example of. - active transport.
Which membrane forms a pocket that pinches inward?
In endocytosis, the plasma membrane forms a pocket that pinches inward, forming a vesicle that contains material from outside the cell.
How does a molecule move down its concentration gradient?
A molecule moves down its concentration gradient using a transport protein in the plasma membrane. This is an example of
Which pump moves ions across the plasma membrane against their concentration gradients?
The sodium-potassium pump moves ions across the plasma membrane against their concentration gradients. This requires energy and is an example of active transport.
When membrane proteins allow their target molecules through, energy is expended?
No energy is expended when these membrane proteins allow their target molecules through.
What cells destroy bacteria?
Some white blood cells in the human body are able to engulf bacteria and destroy them. What should this engulfing process be called?
Which membrane forms a pocket that pinches inward, forming a vesicle that contains?
a. the plasma membrane forms a pocket that pinches inward, forming a vesicle that contains material from outside the cell.
What happens when water moves out of a hypotonic solution?
Water will move out of a hypotonic solution into a hypertonic solution.
How do molecules move across the plasma membrane?
c. molecules move across the plasma membrane by crossing the lipid bilayer directly , rather than by using a transport protein.
How does a molecule move down its concentration gradient?
A molecule moves down its concentration gradient using a transport protein in the plasma membrane. This is an example of:
