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Properties of Water Lab
Properties of Water Lab
We completed four laboratory experiments to investigate the properties of water that are vital to biological systems: cohesion, adhesion, solvency, and high specific heat. In the celery experiment, we demonstrated capillary action as dyed water moved upward through the xylem. In the milk experiment, we observed how surface tension can be disrupted by dye. Finally, in the hot and cold water experiment, we showed how differences in density cause blue ice to float while heated red water sinks
Properties of Water Posters
Properties of Water Posters
Our class divided into four groups to create posters explaining the essential properties of water: cohesion and adhesion, solvency, high specific heat and vaporization, and surface tension. Each group described the processes in detail and included visual representations to help classmates better understand and interpret the concepts. These properties are critical because they support many biological functions necessary for life.
Macromolecules Lab
Macromolecules Lab
We conducted four lab tests to identify the macromolecules (lipids, carbohydrates, proteins, and nucleic acids) present in various substances including water, Sprite, oil, oatmeal, apple juice, and milk. To test for these biomolecules, we used iodine, Biuret’s solution, and Benedict’s solution as indicators. The experimental data is recorded below.
Macromolecules Posters
Macromolecules Posters
Our class split into groups to create posters explaining the four main macromolecule classifications: carbohydrates, lipids, proteins, and nucleic acids. Each group described the structure and function of their assigned macromolecule and included visual representations to help peers better understand and interpret the information. These posters highlighted how each macromolecule is essential for the structure and function of living organisms.
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Active Transport
Active Transport
The term "active transport" describes a variation of intracellular transport that moves against the concentration gradient. The concentration gradient naturally moves molecules from high to low concentration, however active transport utilizes ATP/metabolic energy to move molecules against the gradient. This physical fluid mosaic model properly represents active transport with the addition of a channel protein, which is a type of transmembrane protein assists transporting molecules against the concentration gradient.
Facilitated Diffusion
Facilitated Diffusion
Facilitated diffusion is a type of passive transport that requires the use of membrane transport proteins, but not the use of ATP/metabolic energy. This section of the model is the 2nd part of the fluid mosaic model. The model has the sections of the phospholipid bilayer labeled, which are the hydrophilic polar head, and the hydrophobic non polar fatty acid tails. Cholesterol is also included in the model, which is a factor that controls the fluidity of the cell membrane.
Simple Diffusion
Simple Diffusion
Simple diffusion is a type of passive transport that does not require the use of ATP/metabolic energy, or membrane transport proteins. Smaller molecules are able to smoothly transport through the cell membrane, from areas of high concentration to low concentration with the natural concentration gradient. Additionally, the model contains an aquaporin, which is used as a way for water molecules to easily pass through the cell membrane in large amounts. Due to water's polarity, it can be difficult for water molecules to transport through the cell membrane as easily as smaller, non polar molecules.
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Lab reports
Egg Osmosis Lab
Egg Osmosis Lab
This egg osmosis lab demonstrates osmosis using a chicken egg, which is a single, giant cell. The shell of the egg is dissolved, exposing the cell membrane. Then, the egg is placed in different hypotonic and hypertonic solutions, allowing for observations to be made.
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