On your blog, report your findings as a paragraph. Open the discussion with a statement regarding which restaurant the victim visited for his last meal [1 point]. Provide a logical explanation, using data from the tests on the stomach contents, that explains how you reached that conclusion [4 points]. The discussion should explain the results of the investigation in regard to the scientific concepts that are being applied in the investigation. In this case, the scientific concepts being applied are macromolecules and the specific chemical tests used to determine their presence
After the macromolecule testing was finished, I concluded that the victim's final meal was at Bene Bene.
There are three options that the victim could have eaten his final meal: Pizza Express, Blue Frog, and Bene Bene. In Pizza express the victim would typically order a pizza with sausage, pepperoni, and bacon. According to research, the macromolecules that I would expect to find in the stomach contents of the victim if his/her final meal was here are starch, protein, lipids and even a little glucose. In Blue frog, the victim eats wings and celery, and the macromolecules I would find are protein, glucose. Lastly, Bene Bene the victim eats bread, olive oil, and pasta. The macromolecules, if the victim ate his last meal here, I would find would be lipid, glucose, and starch.
To test if the stomach contained starch, I went through the chemical test by gently shaking the mixture of iodine and the stomach content. The result for the starch testing was positive since the color of the content changed into blue black. Then I checked the content again if it contained glucose by gently shaking the mixture of Benedict and Glucose and putting it into water that is about 40-50 degrees Celsius. The results were once again positive, changing its color into green. I also checked lipid in the content by adding Sudan Red and gently shaking it together. The fat molecules floated above the surface and was clearly separated. Lastly, I checked for protein in the content but the results were unlike the rest of the testings, negative. After adding Buiret into the content and shaking it,the color still remained blue, indicating that the content did not contain any protein.
Why do we have so many cells? What would happen if humans had 1/2 the cells, but they were twice the size? Use evidence from the class activity to justify your answer.
One of the main purposes of cells in our body is to transport molecules from one place to another either by passive or active transport. Since such cells are extremely small, our body needs many cells in order to transport nutrients and produce energy from the cells. If humans were to have ½ the cells but twice the size, the human body would not function properly for 2 main reasons.
To begin with, the ratio between the surface area and the volume determines how much the cells can transport nutrients by absorbing them. For instance, if we were to imagine all cells as a squared cell, the bigger the cells size become the less absorption of nutrients. This is simple math. If our cell size were 1 over 1, the surface area would be 6 while the volume would be 1. The ratio then would be 6: 1. If our cell size were 2 over 2, the surface area would be 24 while the volume would be 8. There is a change in the ratio. The ratio becomes 3:1. If our cell size were 3 over 3, the surface area would be 54 while the volume is 27. The ratio would change into 2:1. The changed ratio refers greatly to the ability to diffuse molecules. Compared to the 1 over 1 cube, which has a bigger ratio of surface area, the 3 over 3 cube would not be able to diffuse as much because the volume has increased too much. The first cube has more pathways for diffusion while the 3rd cube does not.
In addition, reducing the number of cells may cause more problems. Since our cells would be bigger, the cells would not be able to absorb nutrients as efficient as the smaller cells. The cells, therefore, should increase in numbers in order to function properly because each cell can only absorb a certain amount of nutrients. However, if we reduce ½ the amount of the original number of cells, the cells would not be able to function as a transporter.
Hence, the smaller and the more cells we have, the cells would able to function and absorb nutrients properly. The size of the cells and the number of cells are already fit so we should not reduce the number of the cells and the size.
Roots of Plants: They need oxygen for growth and produce CO2 to leave the soil Earthworms: Improve the gas exchange with the roots by 1. creating permanent burrows 2. Soil Aggregation: improved by Earthworm's guts
Earthworms: excrete phosphorus, potassium, calcium, zinc and boron in casts Earthworms stabilize soil pH: due to the organic molecules in the guts which produces neutral pH soil Earthworms absorb and excrete H2O through their skin and nephridium Earthworms absorb Oxygen and excrete CO2 through their skin The skin is protected by a thin cuticle for moist surface to absorb and excrete substances
Plants: Oxygen, H2O is absorbed and CO2 is diffused out through stomata in the leaves Plants: Excrete H2O through transpiration
What factors influence how a population changes over time? (Use important new vocab from today's work. Make CONNECTIONS between ideas and SIMPLIFY what you have learned. QUALITY not quantity!!)
Populations increase when more organisms enter a population (immigration) than organisms leave it (emigration) or when more organisms are born than die. The opposite is true: Population decrease when more organisms leave than enter or more organisms die than are born. Exponential growth- the population starts off growing very slowly, but then started to grow faster and faster (when there is enough food, space, and other resources for every single organisms) with a J Curve
When limiting factors affect population growth, it is called a Logistic growth with a S curve Some limiting factors include the following: Density-dependent factors include food, space/ shelter, water, disease, and predation Density-independent limiting factors include weather and natural disasters
The number of individuals that an environment can support is called carrying capacity. Sometimes the overall population may be above carrying capacity,but it would only be there temporarily.