Tutor profile: Ariel R.
Subject: Environmental Science
A corporation has decided to convert its headquarters from using oil to heat their building to an alternative method. Describe one alternative energy source that would reduce the carbon footprint of the headquarters. Discuss a benefit, and a drawback of using that alternative energy source.
Nuclear power is an alternative energy source that could reduce the carbon footprint. A benefit of nuclear power is zero carbon emissions. A drawback of nuclear power is that they are very expensive to build.
Subject: Basic Chemistry
What is the difference between an acid and a base?
An acid is a substance that has a pH below 7, donates a proton, or accepts a pair of valence electrons, depending on the definition you are using. A base has a pH above 7 (through 14), accepts a proton, or donates a pair of valence electrons to form a bond. Acids and bases have different physical properties as well. Acids have a sour taste, while bases have a bitter taste.
The transportation of substances in and out of a cell is regulated by the cell membrane. Explain how the cell membrane is selectively permeable, and why it is important.
Selective permeability of the cell refers to the ability for the cell to allow certain molecules into and out of the cell, and not others. Selective permeability is important because it allows the cell to obtain nutrients and eliminate wastes. This contributes to the overall homeostasis of the cell, and ensures that the cell maintains a balanced state of equilibrium.