Which is an example of passive transport across a cell membrane quizlet?
Examples of passive transport include simple diffusion, facilitated diffusion and osmosis.
Why does passive transport require no energy?
Passive transport requires no energy input, as compounds are able to move freely across the membrane based only on a favourable concentration gradient (Figure 1.11).
What would not move freely across the cytoplasmic membrane?
Water cannot pass freely across the membrane. Water requires a special permease. Water movement is driven by the concentration of solutes rather than its own concentration. Nonspecific permeases allow only water to cross the cytoplasmic membrane.
Which type of active transport protein moves two molecules into the cell?
The type of active transport protein that moves two molecules into the cell at the same time is called a symporter.
Which of the following best describes passive transport?
Which of the following best describes passive transport? It does not require energy and moves molecules with the concentration gradient.
Which of the following describes passive transport?
Passive transport is a naturally occurring phenomenon and does not require the cell to expend energy to accomplish the movement. In passive transport, substances move from an area of higher concentration to an area of lower concentration in a process called diffusion.
How does the passive transport work?
In passive transport, substances simply move from an area of higher concentration to an area of lower concentration, which does not require the input of energy. Concentration gradient, size of the particles that are diffusing, and temperature of the system affect the rate of diffusion.
Why does passive transport occur?
Passive transport usually occurs down a concentration gradient. Essentially what this means is that molecules will move from areas where there are more of them to where there are fewer of them.
Which of the following statements about passive transport is correct?
Passive transport permits the solute to move in either direction, but the net movement of the population of solute occurs down the concentration gradient of the molecule. Correct. Passive transport can occur in either direction, but the direction of net diffusion is down the concentration gradient of the solute.
What are types of passive transport?
There are four types of passive transport:
- Simple Diffusion.
- Facilitated Diffusion.
- Filtration.
- Osmosis.
Which of the following types of molecules may passively diffuse across a membrane?
Gases, hydrophobic molecules, and small polar uncharged molecules can diffuse through phospholipid bilayers. Larger polar molecules and charged molecules cannot.
Which statement describes a type of passive transport in cells?
What statement describes passive transport? Particles move from areas of high concentration to areas of low concentration. Predict the size of the blue whales cells compared to human cells.
Which of the following is an example of passive transport across a membrane?
Answer and Explanation: An example of passive transport across a cell membrane is the diffusion of oxygen from the alveoli into the blood.
What is the end result of passive transport?
In passive transport, substances simply move from an area of higher concentration to an area of lower concentration, which does not require the input of energy.
What are the characteristics of passive transport?
The simplest forms of transport across a membrane are passive. Passive transport does not require the cell to expend any energy and involves a substance diffusing down its concentration gradient across a membrane.
What are the features of passive transport?
Features of Passive Transport Passive transport occurs by simple diffusion or via pores in the plasma membrane. The passive forms of transport, diffusion, and osmosis move material of small molecular weight. Passive transport is independent of membrane proteins and the catabolism of biological molecules for energy.
Which of the following correctly describes passive transport?
Passive transport permits the solute to move in either direction, but the net movement of the population of solute occurs down the concentration gradient of the molecule. Correct. Passive transport can occur in either direction, but the direction of net diffusion is down the concentration gradient of the solute.
Which best describes passive transport?
Passive transport is a naturally occurring phenomenon and does not require the cell to expend energy to accomplish the movement. In passive transport, substances move from an area of higher concentration to an area of lower concentration in a process called diffusion.
What determines whether a transport is active or passive?
There are two major ways that molecules can be moved across a membrane, and the distinction has to do with whether or not cell energy is used. Passive mechanisms like diffusion use no energy, while active transport requires energy to get done.
What does passive transport move?
In passive transport, substances simply move from an area of higher concentration to an area of lower concentration, which does not require the input of energy.
How is passive transport described quizlet?
Passive Transport. the movement of materials across a cell membrane that uses NO energy.
Which of the following defines passive transport?
Passive transport is defined as a type of transport that moves substances from an area of greater concentration to an area of lesser concentration.
What describes the transport of materials across a cell membrane?
Active transport is the movement of molecules across a cell membrane in the direction against their concentration gradient, going from a low concentration to a high concentration.
Which of the following best describes passive transport of materials across a membrane?
Which of the following best describes passive transport? It does not require energy and moves molecules with the concentration gradient.
Which factor determines whether movement across a cell membrane is active transport or passive transport?
Concentration and Diffusion Electrochemical and kinetic energy both power diffusion. The primary determinant of whether a molecule will diffuse across a cell membrane is the concentration of the molecule on each side of the cell membrane.
What is passive transport example?
Summary. Passive transport does not require energy input. An example of passive transport is diffusion, the movement of molecules from an area of high concentration to an area of low concentration. Carrier proteins and channel proteins are involved in facilitated diffusion.
What 2 characteristics determine how a substance will travel across the membrane?
The ability of a molecule to travel across a membrane depends on its concentration, charge and size. In general, molecules diffuse across membranes from areas of high concentration to low concentration. Cell membranes prevent charged molecules from entering the cell unless the cell maintains an electrical potential.
What determines whether a transport process is passive or active?
There are two major ways that molecules can be moved across a membrane, and the distinction has to do with whether or not cell energy is used. Passive mechanisms like diffusion use no energy, while active transport requires energy to get done.
What are two characteristics of passive transport?
The simplest forms of transport across a membrane are passive. Passive transport does not require the cell to expend any energy and involves a substance diffusing down its concentration gradient across a membrane.
What are the 3 types of passive transport?
There are three main types of passive transport: Simple diffusion – movement of small or lipophilic molecules (e.g. O2, CO2, etc.) Osmosis – movement of water molecules (dependent on solute concentrations) Facilitated diffusion – movement of large or charged molecules via membrane proteins (e.g. ions, sucrose, etc.)