Re-write the following statement to correct any inaccuracies: Diffusion is a gra
ID: 45319 • Letter: R
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Re-write the following statement to correct any inaccuracies: Diffusion is a gradient-driven process that is spontaneous and random. Your correction: Diffusion is ... The definition of diffusion is the tendency of molecules to move from an area of high concentration to an area of low concentration . According to this definition, are the sugar molecules in the model above undergoing diffusion? Explain. Are the water molecules in the model undergoing diffusion? Explain. Cell Membranes Discussion Term List Use the vocab listed below to fill in the blanks Cell membrane lipid bilayer Phospholipids Selectively permeable membrane protein Osmosis Mitochondria active transport Diffusion Passive transport Solute Surface area Solvent Polar/Nonpolar The cell membrane is composed of proteins, steroids, and carbohydrates. The is a thin polar membrane made of two layers of lipid molecules embedded with proteins. The is meaning that it only allows the diffusion of certain molecules in and out of the cell. The amphipathic nature of a allows the cell membrane to be a barrier to some molecules, and not others . The surface are of the of a eukaryotic cell does not limit the cell size because these cells have internalized the membranes they use for energy production in an organelle called the . Transport across the cell membrane comes in different flavors. requires energy while does not require energy. No proteins are necessary for nonpolar solute to enter the cell as these types of compounds can enter the cell through . Pumps are a good term to use when describing a that performs active transport. Channels are a good term to use when describing a that does passive transport. The movement of water across membranes is called . Water is the universal ,anything dissolved in the water would be considered a . The of the cell membrane allows molecules such as hydrogen gas to enter the cell by ,but molecules such as glucose must enter the cell through a .Explanation / Answer
1. Diffusion is a gradient-driven process but is non-spontaneous and does not occur randomly.
It is the movement of water from its higher-concentration to the lower concentration, through a semi-permeable membrane.
2. Ratio of water to sugar : Inside the cell - 1: 5, Outside the cell - 1 : 1
A. The sugar molecules are not undergoing diffusion, a sdiffusion is the movement of water from its higher concentration to its lower concentration. The solute does not undergo diffusion process.
B. The water molecules will undergo diffusion. The process itself says that the movement is of the water molecules from its higher concentration to its lower concentration. Therefore, the water molecules do undergo diffusion.
FILL IN THE BLANKS :
A. Phospholipid
B. Llipid bilayer
C. Cell membrane, Selectively permeable
D. Selectively permeable
E. Cell membrane, Mitochondria
F. Active transport, Passive transport
G. Surface area
H. Solvent
I. Solute
J. Osmosis
K. Solvent, solute
L. Membrane proteins, passive transport, active transport
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