Biology, 10.02.2020 06:17 shartiarahoward

A student performed an experiment with bags of dialysis tubing filled with distilled water to model the process of osmosis. Dialysis
tubing is a semi-permeable membrane that allows some materials to passively move through the tubing. The dialysis tubing bags
were massed on a balance and then placed in beakers with solutions of sucrose of various concentrations, ranging from OM to 10M
Sucrose
Select which question the experimental design is best addressing?

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Answers

Taking into account the principle of osmosis, the question that best addresses experimental design is How does the effect of environmental sucrose concentrations impact the movement of water across a membrane?

Explanation:

Options for this question:

How do hypotonic solutions prevent cells from surviving? How do freshwater organisms maintain homeostasis when placed into a hypertonic condition? How does the effect of environmental sucrose concentrations impact the movement of water across a membrane? How does the temperature in which bags of dialysis tubing are placed directly impact the exchange of materials across the membrane?

The experimental design of the student, made with dialysis bags and sucrose at different concentrations should recreate the principle of osmosis, of importance in living beings for organic homeostasis.

Osmosis consists of the movement of water - through a semi-permeable membrane - from a less concentrated solution to a higher concentration solution, following a gradient, to achieve balance.

The student will observe in his experiment that water moves from the solution with less sucrose concentration to the higher concentration of sugar. Beakers with the highest concentration of sucrose will have the highest weight, due to the increase in liquid volume.

How does the effect of environmental sucrose concentrations impact the movement of water across a membrane?

The experiment shows that:

The water from the beaker with less sucrose concentration moved -through the dialysis tubes and the membrane- to the beaker containing the most concentrated sucrose.Different sucrose concentrations will attract different amounts of water, which influences the final weight of each container.

With this experiment the principle of osmosis is confirmed, where the concentration of a solute determines the amount of water that passes through a semipermeable membrane -following a concentration gradient- until equilibrium is reached.

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Answer from: Quest

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.