A major difference between red blood cells and Elodea cells is that Elodea cells have a cell wall, which protects them from bursting.
True or False?
True
False
The Correct Answer is A
Red blood cells are animal cells that lack a cell wall, a rigid structure that surrounds the cell membrane of plant cells, such as Elodea cells. A cell wall provides support and protection for the cell, and prevents excessive water uptake or loss. Red blood cells, on the other hand, rely on the osmotic balance of their environment to maintain their shape and function. If red blood cells are placed in a hypotonic solution, where the water concentration is higher outside than inside the cell, they will swell and burst due to osmosis. This is called hemolysis. If red blood cells are placed in a hypertonic solution, where the water concentration is lower outside than inside the cell, they will shrink and lose their ability to carry oxygen. This is called crenation.
Elodea cells, however, can withstand hypotonic or hypertonic solutions without bursting or shrinking, because their cell wall prevents the water from entering or leaving the cell beyond a certain point. Therefore, a major difference between red blood cells and Elodea cells is that Elodea cells have a cell wall, which protects them from bursting.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration across a semi-permeable membrane. Diffusion stops when there is no net movement of particles across the membrane, which means that the rate of diffusion in one direction is equal to the rate of diffusion in the opposite direction.
This does not necessarily mean that there is an equal concentration of particles on both sides of the membrane, but rather that there is a dynamic equilibrium between the two sides. For example, if a semi-permeable membrane separates a solution of 10% sugar and 90% water from a solution of 20% sugar and 80% water, diffusion will occur until the sugar concentration on both sides is 15%.
However, if the membrane only allows water to pass through, diffusion will occur until the water concentration on both sides is equal, which means that the sugar concentration on one side will be higher than the other. Therefore, diffusion does not always result in an equal concentration of particles on both sides of a semi-permeable membrane.
Correct Answer is C
Explanation
Choice A rationale: Starch solution is not a protein solution, but a carbohydrate solution. Starch is a polysaccharide, which is a polymer of glucose molecules. Starch does not contain peptide bonds, which are the bonds that link amino acids in proteins. Therefore, starch solution would not react with the biuret reagent and would not produce a violet color.
Choice B rationale: Olive oil is not a protein solution, but a lipid solution. Olive oil is mainly composed of triglycerides, which are esters of glycerol and fatty acids. Olive oil does not contain peptide bonds, which are the bonds that link amino acids in proteins. Therefore, olive oil would not react with the biuret reagent and would not produce a violet color.
Choice C rationale: Albumin solution is a protein solution. Albumin is a globular protein that is found in blood plasma and egg white. Albumin contains many peptide bonds, which are the bonds that link amino acids in proteins. Therefore, albumin solution would react with the biuret reagent and would produce a violet color.
Choice D rationale: Distilled water is not a protein solution, but a pure solvent. Distilled water is water that has been purified by boiling and condensing. Distilled water does not contain any solutes, such as proteins, carbohydrates, or lipids. Therefore, distilled water would not react with the biuret reagent and would not produce a violet color.
Choice E rationale: Glucose solution is not a protein solution, but a carbohydrate solution. Glucose is a monosaccharide, which is a simple sugar. Glucose does not contain peptide bonds, which are the bonds that link amino acids in proteins. Therefore, glucose solution would not react with the biuret reagent and would not produce a violet color.
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