Why should it not be surprising that for many cells water requires a protein for its transport across a membrane? A. There is never a concentration gradient for water across the membrane to drive its transport. B. The transport protein is needed to prevent the hydrolysis of the phospholipid chains as water crosses the membrane. C. Water is very polar which inhibits its free diffusion across the membrane. D. All molecules require transport proteins to cross a membrane.    In the mitochondria phosphate ion (PO43-) and H+ are transported together from the intermembrane space into the matrix. Which statement applies? A. The interior of the transport protein must be uncharged. B. The transport protein must have a relatively large central channel to accommodate both ions. C. The transport protein is a symport. D. All of the above

Q: Among the membrane transporters, the channels require energy and therefore are involved in active…

A: Channel protein form pores through membrane allowing the free diffusion of any molecule of the…

Q: Which of these processes are membrane-crossing mechanisms that require no energy input? Select all…

A: Transport mechanisms are of two types - active transport that requires energy expenditure and…

Q: Which of the statements about diffusion are true? Select all that apply.     A. Solutes diffuse from…

A: The movement of particles is dependent on multiple factors including the charge on particle,…

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Q: If a cell is hypertonic to its environment, what may happen as a result of osmosis? A. its volume…

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Q: Which of the following statements is true about active transport? A. The transported species always…

A: Active transport is a mode of transport of molecules against the concentration gradient using…

Q: In addition to phospholipids, eukaryotic membranes also contain sterols of various kinds. What's the…

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A: Cholera toxin also called as choleragen which is abbreviated as CTX, it is AB5 multimeric protein…

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Q: How does ATP relate to membrane transport?a. The movement of a substance down its concentration…

A: Adenosine triphosphate (ATP) is defined as an energy-carrying molecule that is present in all living…

Q: Facilitated transport differs from diffusion in that facilitated diffusiona. involves the passive…

A: Answer is b.)  involves active use of a carrier protein.

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A: Phospholipid bilayer is an asymmetric membrane in which asymmetry is contributed by a number of…

Q: From the list below choose all which apply to the process of diffusion.  A. Requires energy B.…

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Q: Question 8. How do cells transport small, nonpolar, hydrophobic molecules, such as fatty acids or…

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Q: Which type of transporter chemically alters glucose during passage across the membrane?. a. ABC…

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Q: You make a phospholipid bilayer with short saturated hydro carbon tails. You measure the…

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Q: Facilitated diffusion differs from active transport in thatfacilitated diffusiona. expends no ATP.b.…

A: The cell membrane is semipermeable and allows only certain molecules transportation from in and out…

Q: Which of the following statements is correct? A. A transmembrane integral protein is required…

A: The cell membrane, also known as the plasma membrane, is found in all cells and serves to separate…

Q: Which of the following statements regarding the selective permeability of the lipid bilayer is…

A: The plasma or cell membrane contains a bimolecular phospholipid layer with polar heads and non polar…

Q: Transepithelial transport of glucose by the enterocyte utilizes which of the following sequences of…

A: Option D: First secondary active transport, then facilitated diffusion .

Q: Why are phospholipids the main lipid component of membranes? A. these molecules can interact with…

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Q: substances be transported across a membrane against their concentration gradient?

A: Some membrane proteins are ATP-dependent carrier molecules.

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A: The question is asking why glucose is converted to glucose-6-phosphate once it enters a cell. The…

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Q: The presence of cholesterol regulates the in animal cells.

A: Dietary cholesterol levels have a strong influence on the quantity of cholesterol produced in the…

Q: Why are ion channels necessary to transport ions into or out of a cell? a. Ions are too large to…

A: The answer to the above question is option (b) (b) Ions are charged particles and cannot diffuse…

Q: Where will the energy for active transport be derived from? A. Hydrolysis of ATP B. Co-transport of…

A: Active transport is the movement of ions and molecules from a region of low concentration to a…

Q: Which is the major function of glycoproteins and glycolipids in animal cell membranes? Select one: O…

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A: Given: The function of tight junction.

Q: Active transport is different from passive transport because a. no additional energy is required.…

A: Transport is defined as the process of transfer in the molecules from the one side of the membrane…

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Q: Imagine a cell can perform exocytosis, but only minimalendocytosis. What would happen to the cell?a.…

A: The term endocytosis was coined by Christian de Duve. It is divided into phagocytosis and…

Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.