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What best describes the general direction of diffusion across the membrane of this cell?
Wiki User
∙ 12y ago
Carbon dioxide would diffuse out of the cell
Wiki User
∙ 12y ago
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What are molecules that tend to move form an area of high concentration?
Diffusion is the general term. Osmosis is the diffusion of water through a semi-permeable membrane.
Name 2 types of passive transport?
Diffusion-the random movement of molecules from an area of higher concentration to an area of lower concentration.Osmosis-the diffusion of water across a semipermeable membrane.
Does facilitated diffusion move a substance following its concentration gradient with the aid of a carrier protein?
No.All diffusion, including facilitated diffusion, results in a substance spreading out, so there is a general (net) movement away from higher concentrations to lower ones."Facilitated" just means that special proteins in the cell membrane let substances through that could not get through any other part of the membrane. It's like wanting to get the other side of a wall. A door facilitates your progress!
Do molecules need energy to get in and out of the cell?
To clarify the question: the molecules do not need energy to enter or exit the cell, the cells need to spend the energy to get some molecules in or out--however, the answer to your question is: It depends on the molecule, and the cell.Molecules can move into and out of cells by two broad methods: Passive transport, and Active transport.Passive transport requires no energy and involves diffusion (the moving of the molecule from an area of high concentration to low concentration WITH its concentration gradient--it spreads out, into the areas where there isn't any already). One type of diffusion is regular diffusion for molecules that can pass through the membrane (these molecules are said to be "lipophilic" as they interact with the lipid membrane easily). Another type of diffusion is facilitated diffusion--the molecule uses an open channel in the cell to move (does not pass through the membrane by itself). However, the channel is open and does not require energy to function.Active transport requires energy to work. These can be gated channels, "pumps" and other types of transport proteins. Active transport usually moves molecules AGAINST their concentration gradient (from low concentration to high concentration). This is the opposite of diffusion. Remember, the cell is paying this energy debt, not the molecule.In general, lipophilic (hydrophobic) molecules usually do not need energy to cross the cell membrane while lipophobic (hydrophilic) molecules do. The lipophobic molecules often carry a charge (positive or negative) which renders them unable to pass through the membrane, though just a partial charge (polarity) can be enough to keep them in our out. In contrast the lipophilic molecules are electronically neutral and not polar.
The structure and properties of the cell wall allow it to be selective and maintain homeostasis True or false?
False! It is the cell membrane that regulates the composition of the cell. In general, cell walls are highly permeable and allow most things to pass through in either direction.
What are metaphors for 'diffusion'?
Diffusion is the movement of a mineral or nutrient moving across the concentration gradient of a membrane. The closest word to diffusion would probobly be osmosis, which is the movement of water through a membrane.
What is the tendency of fluids to move through a membrane?
Osmosis for water and diffusion just in general
What is it called when particles travel from an area of high concentration to an aera of low concentration?
Through passive transport
What is the difference between simple diffusion and facilitated diffusion?
It doesn't. (answer by RRU member Cyrem)
What are molecules that tend to move form an area of high concentration?
Diffusion is the general term. Osmosis is the diffusion of water through a semi-permeable membrane.
Name 2 types of passive transport?
Diffusion-the random movement of molecules from an area of higher concentration to an area of lower concentration.Osmosis-the diffusion of water across a semipermeable membrane.
Does a force vector describe the direction and the speed of a force?
Yes, basically. But please note that there is no such thing as the "speed of a force". A force vector describes the magnitude of a force, and its direction. In general, a physical vector - the vectors commonly used in physics - describes the magnitude of something, and its direction.
What describes the movement of air in general?
doldrums,land breeze,polar easterlies,prevailing,westerlies,trade winds,and sea breeze.
What is the process called when molecules pass through a membrane to a different conecntration?
This would depend on A) the molecule B) the membrane/proteins involved, and C) the concentrations.Diffusion in general would be the passage of molecules from an area of higher concentration to an area of lower concentration.This can be broken down into either FACILITATED DIFFUSION(through specialized integral protein channels) or SIMPLE DIFFUSION (through the membrane itself, only with tiny uncharged particles).ACTIVE TRANSPORT is normally from an area of lower to higher concentration and requires ATP expenditure.
How does osmosis and diffusion affect heart rate?
In general they don't.
How does a cell membrane differ from a body membrane?
A body membrane regulates what goes in the body in general, but the cell membrane regulates what goes in and out if the cell.
How does the bulk flow of filtrate into the capsule differ from diffusion?
The bulk flow of filtrate is a type of diffusion. Diffusion is a broad category of distribution of a substance within another substance. Diffusion can be specific or general in location and rate of flow.
