UNIT 2 FRQ by Chidi Iromuanya

2024-11-18 15:09:42 UTC

The most likely mode of transport aacross the membrane is 80 because the rate of the entry is at 100% meaning it will have a lot of space to move around across the membrane.The information helped me determine the mode of transport because it gave me the external concentration of substances and it gave me the rate of entry of substance L into the cell as a percentage.It gave me everything I needed to know so I wouldn't have to figure it out on my own.

2024-11-18 15:13:46 UTC

Active Transport is the most likely mode of transport across the membrane for the substance to move throughout. This is due to the fact Active Transport requires energy to transfer molecules. According to the data as well the concentration within the cell is greater than the concentration outside of it.

2024-11-18 15:13:51 UTC

The information provided helps determine the most likely mode of transport by providing us with the rate of how much substance is being released or brought into the cell. And also providing with us whether the concentration of outer part of the cell is high or low concentration.

2024-11-18 15:14:01 UTC

Most likely around 31-35ish becuase the maximum entry rate is 100% however half of that would be 50%. Based on the data when the External Concentration reaches the 30 and 40 range the percentage for the rate of entry is around 45-65 % . So half of that would be around the 30's still due to the fact the percentages for the R.O.E aren't exponentially increasing.

2024-11-18 15:14:12 UTC

It might not be capable of entering the cell with that protein since they are large molecules.

2024-11-18 15:14:26 UTC

The biological need for cells to be surrounded by a membrane that's selectively permiable correlates with it's constant search for homeostasis. This is because the cell membrane separates the internal environment of the cell and the external environment of the cell. Which reveals the internal non-polar enviroment is hydrophobic and the external polar enviroment is hydrophilic which is what allows the cell to survive and travel through its aqeuous enviroment.

2024-11-18 15:14:28 UTC

The external concentration of susbstance L that will result in one -half entry of the maximal entry rate is 30 because 45% is only less 5% less than 50% and 50% is half of 100%.

2024-11-18 15:14:35 UTC

Selective permeability is shown in the model since only the lipid-soluble molecules can go through, but the specific water-soluble ones cannot go through unless they go through the transmembrane protein.

2024-11-18 15:14:47 UTC

Since the cell is composed of a phospholipid bilayer, the ends facing its aqeuous enviroment are hydrophilic while the the non-polar ends are are hydrophobic. Overall, the majority of the membranes internal composition is hydrophobic; and because the molecules are hydrophobic as well, the membrane allows it to pass through.

2024-11-18 15:14:49 UTC

The most likely mode of transport across the membrane for substance L is active transport. However, Active transport moves substances against the concentration gradient from an area of lower concentration to an area of higher concentration.

pat100274 — 2024-11-18 15:14:54 UTC

The higher the concentration of the substance outside the cell, the more it is absobred through the membrane. Telling us that this is going through passive transport.

2024-11-18 15:14:56 UTC

If substance L was attached to a large protein instead of free in the culture then substance L rate of entries as percentages would change into smaller percentages and substance L would have to go throuhg the cell membrane and go through the protein channels and go through a whole process instead of being free in the culture.

2024-11-18 15:14:56 UTC

Based on the model the molecules shown crossing the membrane do not require energy to do so as they use passive transport to transport the molecules. Another reason the molecules are moving using passive transport is becuase the molecules are moving from a high to a low concentration.

2024-11-18 15:15:19 UTC

The mode of transport most likely used for substance L is a Channel protein which serves as a "canal" across the cell membrane for polar molecules.

pat100274 — 2024-11-18 15:15:22 UTC

The concentration that would likley result in one half of the entry rate would be 35mM.

2024-11-18 15:15:26 UTC

Cells need to to be surrounded by a membrane that's selectively permeable for different materials because the cell membrane would be able to tell what cell type it is and would be able to protect that cell from other cells and because the cell membrane is selectively permeable it would know what cells it's letting in because certain cells like carbon dioxide wouldn't be able to enter our bodies.

2024-11-18 15:15:28 UTC

The external concentration of substance L that will result in one-half of the maximal entry rate is 33mM.

2024-11-18 15:15:42 UTC

The model shows selectively permeability of the membrane to specific ions because the cell membrane is only allowing water-soluble is in through the membrane channel but not allowing small lipid-soluble into the membrane/phospholipid bilayer.

2024-11-18 15:15:46 UTC

The cell membrane is semi-permeable, the likelihood of substance L entering the cell attached to a large protein is lower than that of substance L free in the culture.

pat100274 — 2024-11-18 15:15:47 UTC

The substance would enter at a slower rate since facilitated diffusion will be taking place, which requires energy from the cell.

2024-11-18 15:15:58 UTC

The phospholipid bilayer that permits small hydrophobic lipid molecules to pass directly across the membrane hydrophobic heads because it doesn't allow the hydrophobic lipid molecules to pass directly through cross the membrane.

2024-11-18 15:16:01 UTC

The external concentration of substance L will be approx 35, and the maximun entry rate will be 50% since were looking for the one-half of the maximal entry rate.

2024-11-18 15:16:08 UTC

The cell needs to be surrounded by a semi-pearmeable membrane as small nonpolar molecules are allowed such as water, oxygen, and carbon unlike large polar molecules which need a channel protein to enter the cell as they are not compatible with the polar molecules. Allowing cells to control the passage of material coming in and going out.

2024-11-18 15:16:15 UTC

The type of transport between L is considered to be is active transport as the concentration gradient moves from low concentration to high concentration mostly due to the fact of ATP input

2024-11-18 15:16:16 UTC

The most likely mode of transport across the membrane for susbstance L is Active Transport. The information provided helped determine the most likely mode of transport since it moves against the concentration gradient and L is consuming energy instead of releasing it therefore the most likely mode of transport is Active Transport.

2024-11-18 15:16:17 UTC

The molecules shown crossing the membrane doesn't seem to require energy because it's passing through the membrane and passive transport doesn't require energy.

pat101876_ — 2024-11-18 15:16:22 UTC

Cells need to be surrounded by a selective permeable membrane to make sure the correct materials pass through it. That's why it uses two methods for materials to pass. The non-polar materials pass directly through the phospholipid bilayer due to it's tails and insides being non-polar while the polar materials pass through the membrane channels.

2024-11-18 15:16:29 UTC

The model shows a selective permeable membrane to specific ions as water-soluble ions are not able to go through the phospholiid bilayer and small lipid soluble ions are able to go through the selective permeable membrane. In the specific water soluble ions, only the solid colored ions cross the membrane channel into the cell. The dotted ions do not cross since the membrane is selectively permeable.

2024-11-18 15:16:29 UTC

If substance L was attached to a large protein it will effect the ability for substance L to enter the cell because the cell can only take in a certain size of substance if the cell takes in a big the substance the cell will get bigger making it slower to move around and also causing it to explode.

2024-11-18 15:16:38 UTC

The external concentration of substance L that will result in one-half of the maximal entry rate will be 20mM

pat100274 — 2024-11-18 15:16:42 UTC

In order for a cell to maintin homeostasis the membrane must be selectivley permeable. If this membrane wasnt selectively permeable its possible that more nutrience would be entering the cell than needed, possibly resulting in apoptosis.

pat101876_ — 2024-11-18 15:16:43 UTC

pat100529 — 2024-11-18 15:16:44 UTC

Substance L likely uses active transport to cross the membrane, moving against its concentration gradient from lower to higher concentration. This process requires energy, as the cell already has a higher concentration of L.

2024-11-18 15:16:44 UTC

Since 45% of the percent of maximum is 30 extrenal concentration as for finding the average out of all the percentages the it would need to be 30 exrenal concentration of substance L.

2024-11-18 15:16:49 UTC

The cells need to be surrounded by a selective permeable membrane because only certain nutrients need to be entered into the cell. If too much nutrients are entered into the cell, the cell will become bigger making it slower to move around. A Selective Permneable membrane only allows certain nutrients/substances to enter the cell.

pat101341 — 2024-11-18 15:16:49 UTC

The most likely mode of transport is active transport. The reason is because it needs the assistance of an external substance.

2024-11-18 15:16:49 UTC

30- 35 would result in 50% maximal entry rate

pat100274 — 2024-11-18 15:16:54 UTC

The model displays a concentration gradient, outside the cell theres more nutirience than in the cell. Meaning that the nutrience outside the cell is being selectively taken in through the plasma membrane.

2024-11-18 15:17:01 UTC

The likely effect on the ability of substance L to enter the cells if substance L is attached to a large protein instead of free in the culture would be lower than if the substance L is free because of the semi-permeable membrane it'd have to cross by it would be difficult without a channel protein for L to enter if it had a large protein attached to it therefore the affect on the ability to enter would be lower.

2024-11-18 15:17:03 UTC

A small hydrphobic lipid can directly pass across the membrane as the molecule is small and the phospholipid tails are hydrophobic which indicate that they are compatible.

2024-11-18 15:17:05 UTC

The model shows selective permeability because it shows how the cell is only allowing certain nutrients to enter the cell, not all nutrients are allowed to enter the cell when there is a selective permeable membrane because this membrane is very picky with what get's to enter the membrane.

pat101876_ — 2024-11-18 15:17:07 UTC

In the interior of the phospholipid bilayer is were the hydrophobic tails are joined together to make the structure of the layer. This makes it imposible for water-soluble molecules to pass through it since the tails prevent water to come in. The small hydrophobic molecules pass through the heads and into the hydrophobic interior.

pat100529 — 2024-11-18 15:17:09 UTC

pat100274 — 2024-11-18 15:17:15 UTC

The process that is likely taking place is endocytosis. In order for entocytosis to occur, pores open up in the cells surface and transpoert proteins capture the entering nutrience in order for it to be taken through the membrane.

2024-11-18 15:17:19 UTC

The biological need for cells to be surrounded by a membrane that is selectively permeable for different materials is to keep certain things out and let easier access to certain things like water, oxygen, and carbon dioxide to come in and out of the cell with ease. Other material such as large proteins would need to enter through a channel membrane to get in and out of the cell.

2024-11-18 15:17:19 UTC

The characteristicsd of the phospholipid bilayer that permits small hydrophobic lipid molecules a is that it is double layered, contains hydrophobic tails that arean't good in too much water environments, also contains hydrophilic heads that work better in water enviroments that's why they are called hydrophilic heads. They also contain a channel that allows specific large molecules to go throught the membrane without messing anything up.

2024-11-18 15:17:19 UTC

It would become harder for the substance L had a protein to enter the cell as usually large molecules have it harder to enter a cell membrane compaed to smaller moleules. Compared to the substance being free in its culture and being able to past throught the phospholipid bilayer.

2024-11-18 15:17:28 UTC

This permeable ability is important for certain proteins to get in and out of the cell as it provides a selective filter for the cells benefit.

2024-11-18 15:17:29 UTC

The model shows selective permeability of the membrane to specific ions by showing how small lipid-soluble molecules can go throught the selective permeable membrane while specific water-soluble ions can't pass through without the help of a channel membrane.

pat100274 — 2024-11-18 15:17:30 UTC

The molecules crossing the membrane require input energy becasue theyre going through passive transport. All molecules shown in the model are moving with the concentration gradient, nothing is moving against it.

pat101341 — 2024-11-18 15:17:32 UTC

45 external concentration of substance L will result in one half of the maximal entry rate.

2024-11-18 15:17:33 UTC

The water-soluble ions shown crossing the membrane do require energy since the travel through active transport. The smalllipid-soluble molecules do not require energy they travel by passive transport.

2024-11-18 15:17:35 UTC

The molecules shown crossing the membrane do not need energy to enter the membrane because the membrane is selective permeable meaning the membrane is doing all the work of bringing in these nutrients that are helpful for the cell.

2024-11-18 15:17:36 UTC

The characteristics of the phospholipid bilayer that permit small hydrophobic lipid molecules to pass directly across the membrane because of the hydrophobic tails and hydrophilic heads that lets small molecules such as water and oxygen to come in and out of the cell without needing a channel membrane.

2024-11-18 15:17:48 UTC

Based on the model, the molecules shown crossing the membrane require energy because they are moving against the concentration gradient through the membrane using Active Transport therefore they require energy to do so.

pat100529 — 2024-11-18 15:17:53 UTC

33 mM

pat101341 — 2024-11-18 15:17:56 UTC

It will most likely have easy entry through the transmembrane protein because cells need proteins to live.

2024-11-18 15:17:57 UTC

Small lipid-soluble molecules dont need a channel protein because these molecules are non-polar molecules and can go through the phospholipid bilayer and the hydrophobic tails, specific water-soluble ions are polar so the channel protein works as a canal through the phospholipid bilayer.

2024-11-18 15:18:06 UTC

The membrane protects the cell from injury and damage and allows certain substances to enter it as each cell has a different function. Now smaller molecules like Carbon, Oxygen and Nitrogen are able to enter the selective permeable easier as its necessary for the cell survival and the living organism survival.

pat100529 — 2024-11-18 15:18:12 UTC

Since the cell membrane is semi-peremable, substance L is less likely to enter attached to a large protein than when free. Active transport allows L to enter, but the membrane may block the larger protein, preventing L from passing through.

pat101341 — 2024-11-18 15:18:22 UTC

The cell will only allow certain materials that is needed in through the selective permeable membrane, making it a biological need.

2024-11-18 15:18:24 UTC

By then being hydrophobic it's easier for them to get through the phospholipid bilayer as this structure is made out of hydrophilic heads, which are on the outside and hydrophobic heads on the inside. Hydrophobic/non-polar molecules can get through the phospholipid bilayer, hydrophilic/polar molecules cannot.

2024-11-18 15:18:29 UTC

The response indicates that substance L most likely crosses the membrane by active transport.

pat101341 — 2024-11-18 15:18:34 UTC

The membrane's selective permeability only allowed the non dotted water solube ions to be let in the cell. It shows how the membrane only allows specific things inside while keeping others out.

pat100529 — 2024-11-18 15:18:38 UTC

A semi-peremable membrane enables cells to control material passage, helping maintain homeostasis by allowing only specific molecues to cross which is essential for cell function and survival.

pat101341 — 2024-11-18 15:18:39 UTC

The phospholipid bilayer permits small hydrophobic lipid molecules to pass because every cell needs macromolecules, which allows this lipid to go in and out when ever it needs.

pat100529 — 2024-11-18 15:18:48 UTC

The model demonstrates the membranes selective permeability to specific ions onl the solid colored ions can cross the channel into the cell, while the dotted ions cannot.

2024-11-18 15:18:56 UTC

It requires energy as the molecules move with the concentration gradient from low to high concentration.

pat101341 — 2024-11-18 15:19:05 UTC

The small lipid solube molecule does not require energy where was the specific water solube ions do. The reason is because the small lipid solube molecules can come and go whenever they please, meanwhile the water solube ions must go through the transmembrane protein.

pat100529 — 2024-11-18 15:19:18 UTC

The phospholipid bilayer consists of molecules with hydrophilic heads facing outward and hydrophobic tails inward. Small hydrophobic molecules can easily pass through the membrane while hydrophillic molecules cannot as they are excluded from the membranes interior.

pat100529 — 2024-11-18 15:19:27 UTC

The specific water soluble ions crossing the membrane require enegry for active transport, as they move against the concentration gradient from higher concentration from inside of the cell to outside. In contrast, small lipid soluble molecules use passive transport, crossing the membrane easily without energy due to their hydrophobic nature.