Ions cannot cross directly through a lipid bilayer, yet we know they travel in and out of cells. Which of the following is/are true about how ions diffuse cross membranes?   a)  They diffuse down their concentration gradients.   b)  They diffuse through channels formed by integral membrane proteins.   c)  They diffuse down their electrical gradients.   d)  a and c   e)  a, b and c

Q: In terms of their effect on the rate of diffusion, which of the following is the odd one out? a)…

A: The process by which molecules move from a region of higher concentration to a region of lower…

Q: The inside negative membrane potential is a force that helps support... a.) the movement of…

A: *Membrane potential forces ions to move passively in one direction. *positive ions are attracted by…

Q: 7) Which is the best definition of osmosis? a) movement of molecules from an area of their higher…

A: Diffusion is a process by which molecules or substances move from a higher concentration to a lower…

Q: In osmosis, water moves from a ---------------- solution to a --------------------- solution

A: To find: The movement of water in osmosis

Q: Which term best describes the following scenario: Calcium ions travel through the cell membrane into…

A: Only some substances move through the cell membrane because cell membrane is selectively permeable…

Q: 1. Indicate which statement is incorrect. a) Channel proteins are open from both sides so that…

A: introduction: The cell membrane can be easily traversed by small, nonpolar molecules. Polar…

Q: "In a beaker containing 6% NaCl, you place a cell which contains 0.9% NaCl. NaCl doesn t cross the…

A: Introduction :  Osmosis is a passive process and happens without any use of energy. It involves the…

Q: Water moves molecules passively across a cell membrane by: a)osmosis

A:

Q: Distinguish between simple diffusion (SD), facilitated di

A: Passive transport occurs along the concentration gradient and without the use of metabolic energy.…

Q: Which of the following processes results in the formation of food vesicle within the cell whose…

A: Given: The  processes that results in the formation of food vesicle within the cell whose contents…

Q: Which of the following is involved in the bio-signaling pathway that includes membrane turnover and…

A: Phosphatidylinositol (PI) is a phospholipid that is found in the cell membrane of eukaryotic cells.…

Q: Are actin filaments subject to the same "dynamic instability" as microtubules? Yes or no? b)Explain…

A: Microtubules are the polymeric structure of tubulin that helps to form the skeleton of filaments and…

Q: What do facilitated diffusion, primary active transport and secondary active transport have in…

A: The cells are biological structural and functional units life and are responsible for the execution…

Q: Durning neuronal maturity: A) exocytosis = endocytosis B) endocytosis < exocytosis  C) exocytosis…

A: Neuron maturation is a critical process in neurogenesis, during which neurons gain their…

Q: 11. Determine whether the following statements are true or false. If they are false, provide a…

A: Introduction  Cell transports are the movement of a molecule through the cell membrane. The chemical…

Q: Movement of phospholipids to opposite sides is calleda) Facilitated diffusionb) Lateral diffusionc)…

A: Fluid-Mosaic membrane model is that the components of the bilayers are free to move. Lipids…

Q: What membrane component is represented by A in the diagram? a) cholesterol b) lipid bilayer Oc)…

A: Plasma membrane is the outermost envelope like structure which surrounds the cell and organelles.…

Q: Active transport pumps are used to move sodium ions across the membranes of gill cells in freshwater…

A: Active Transport:  Active transport is the movement of molecules across a cell membrane across a…

Q: If magnesium ions are in higher concentration outside the cell, they would move into the cell by the…

A: Movement across the membrane happens through two pathways. Active mechanism and passive mechanism.…

Q: Diffusion means that a)  smaller particles move across the membrane faster. b)  all particles…

A: The movement of particles from an area of higher concentration to an area of lower concentration…

Q: Our cells need glucose for energy. When blood glucose is low, glucose must still be moved into our…

A: Transportation is a necessary, natural, and physiological activity that happens in all higher…

Q: Which of the following serves as a specific binding site for the proteins involved in membrane…

A: Exocytosis refers to the process of vesicles fusing with the plasma membrane and releasing their…

Q: 19. Which of the following statements is FALSE? A) Nucleotides and amino acids can act as…

A: Growth factors, hormones, cytokines, and neurotransmitters are examples of extracellular signaling…

Q: Which statement is true according to the fluid mosaic model of cell membranes? a) Proteins are…

A: The correct answer is -D  Fluid's Mosaic Model: According to this theory, the plasma membranes of…

Q: The distinctive properties of facilitated diffusion are: (а) Increase the speed of diffusion of…

A: Facilitate diffusion involves the movement of solutes along the concentration gradient.

Q: 9- Which statement is not true about membrane structure? Provides a way of separation of cell…

A: Cell is the structural and functional unit of life. Every living organism is composed of cells.…

Q: When a Prokaryote or Eukaryotic cell is placed in an aqueous (water) solution containing K+ and Na+…

A: A cell membrane separates all cells from their surroundings. The cell membrane controls what enters…

Q: If a scientist drops an animal cell into a solution that contains 10 times more salt than is found…

A: A solution is made up of solute plus solvent . Solution can be :- A ) Hypertonic  B ) Hypotonic  C )…

Q: In cotransport (indirect active transport) (a) a uniporter moves a solute across a membrane against…

A: Indirect active transport uses the downhill flow of an ion to pump some other molecule or ion…

Q: A research student creates an artificial animal cell containing a 5M solution of glucose with a…

A: The correct answer is option (c) Water moves into the cell causing it to lyse/burst.In this…

Q: Simple diffusion across membranes is faster for which type of molecules? a)Lipophilic substances…

A: As per the guidelines, we are supposed to answer only first three questions in case of multiple…

Q: Receptor mediated endocytosis requires the presence of a) primary active transport pumps. D) carrier…

A: Introduction Endocytosis is the formation of an intracellular membrane-bounded vesicle containing…

Q: Both active and passive transports can be subdivided further. Distinguish between the different…

A: According to our guideline we can answer maximum three subparts of a question. So upload the last…

Q: Typically, our cells have a high concentration of sodium ions outside and a low concentration of…

A: There are many proteins present in the cell membrane to transport substances across the cell…

Q: Movement of phospholipids from side to side is calleda) Facilitated diffusionb) Lateral diffusionc)…

A: The fluid mosaic membrane model is that the components of the bilayer are free to move. In…

Q: The following table depicts the rate of transport of a molecule into a cell as the external…

A: In cell science, membrane transport alludes to the assortment of mechanisms that manage the passage…

Q: Filaments connected to the dense plaque underlying the membrane in a desmosome course outward into…

A: The question is asking about the type of protein that composes the filaments connected to the dense…

Q: A cell contains 97% water and it is placed in a 5% salt solution. a) Which contains a higher…

A: Cell membrane The membrane of cell which is made up of phosphate and lipids. This membrane also…

Q: Which of the following modes of transport across biological membranes is driven by a chemical…

A: The cell membrane is a phospholipid bilayer that allows the passage of small and non polar molecules…

Q: Endocytosis and exocytosis are both forms of [ ACTIVE / PASSIVE ] transport that [ DO / DO NOT ]…

A: A subfield of biology called cell biology examines the composition, operation, and behavior of…

Q: Which is an example of passive transport? a) A membrane protein uses a hydrogen ion concentration…

A: Membrane transport allows transportation of material or substance into the cell and out of the cell…

Q: Typically, our cells have a high concentration of sodium ions outside and a low concentration of…

A: Because the concentration of sodium ions  is more outside the cells. This means sodium ions…

Q: Which of the following statements about the sodium-potassium pump is correct?   A) Both sodium and…

A: Sodium-potassium pump is also known as Na+/K+ pump. It is a protein pump found in the cell membrane…

Q: During diffusion, what happens when the concentration of solutes on both sides of the biological…

A: Cell is the basic structural and functional unit of life.

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.