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Tutor profile: Joshua A.

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Joshua A.
High School Science Teacher
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Questions

Subject: Environmental Science

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Question:

Explain how human impact has effected our environment.

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Joshua A.
Answer:

Human impact is well documented when looking at the environment. Since the industrial revolution, humans have put exponentially more CO2 into the atmosphere than ever before. Because of this, we face the severe problem of global climate change today. Some examples of this are the variable temperatures that occur throughout a season, ocean acidification, and natural disasters occurring at a rate that is unprecedented in recent history. When you look at data provided by the National Oceanic and Atmospheric Administration, you can see the difference throughout recent history between temperatures at specific times. For instance, around November 5 years ago, the temperature was significantly colder on average than it is today. Ocean acidification is the process of CO2 entering the ocean. The CO2 reacts with the water, causing the oceans to become more acidic and leaving less calcium carbonate for organisms to create their shells with. This process has increased dramatically over the last 200 years since the industrial revolution.

Subject: Basic Math

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Question:

Johnny and Sarah want to bake an apple pie. Johnny has enough money to buy three apples and Sarah has enough money to buy five apples. Each apple costs $.50. How much money do Johnny and Sarah have together? If one apple pie requires ten apples, how much more money to Johnny and Sarah need?

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Joshua A.
Answer:

If Johnny has enough money to buy three apples at $.50 each, he must have at $1.50, because 3(.50)= 1.50. Similarly, if Sarah has enough money to buy five apples, then she must have 5(.50)= 2.50, or $2.50. This means that all together, Johnny and Sarah have $1.50 + $2.50= $4.00. If Johnny and Sarah need a total of ten apples, and they currently have enough money for eight apples (3 + 5 = 8), then the need enough money to buy two more apples. At $.50 an apple, that means that Johnny and Sarah need $.50(2) = $1.00 more.

Subject: Biology

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Question:

Describe and explain the structure and function of an animal cell. Be sure to explain the role of different organelles inside of the cell.

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Joshua A.
Answer:

The function of an animal cell is to act as the basic unit of life for that animal. This means that the cell must undertake metabolic processes to obtain and use energy, it must conserve energy, and it must reproduce. The structure of the cell and it's organelles helps the cell to accomplish these goals. The mitochondria acts as a power supply for the cell, undergoing Cellular respiration. During cellular respiration, the cell is able to take macro-molecules such as carbohydrates and lipids, obtained from the food the animal eats, and break those molecules down to provide the cell, and therefore the organism, with usable energy in the form of ATP. The nucleus of the cell acts as the brain of the cell. The nucleus contains the organism's DNA. These are the instructions by which the cell completes any task and by which the organism's traits are determined. Through the process of protein synthesis, the DNA is transcribed into mRNA, which can leave the nucleus and travel to the ribosomes. At the ribosome, the mRNA is read (by the ribosome) and tRNA carries a matching amino acid. Multiple amino acids bond together, eventually folding and conforming to each other to create a protein, which is then expressed as a trait, such as eye color or hair color. In addition to providing the code to create proteins, the DNA also allows the cell to replicate itself, through two different processes known as meiosis and mitosis. Meiosis is used solely to reproduce gametes, or sex cells, while the process of mitosis is used to replicate somatic cells, or body cells. The final part of the cell that I am going to talk about is the lysosome. The lysosome's job is to conserve the energy the cell uses by getting rid of unnecessary molecules and organelles. When something is not being used by the cell or waste is present, the lysosome breaks down the material, allowing the cell to use it's available energy for other important functions, such as cellular respiration, protein synthesis, or cellular reproduction.

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