Agar Lab Report

Procedure- The procedure for this lab includes many simple steps and a few different things we are testing. Our first Procedure was to combine water and salt to see what kind of reaction it would make. First we fill the graduated cylinder with 100 ml of water. We then measured 1.0 grams of table salt on a balance to get an accurate amount. After, we took the measured amount of salt and poured it into the water filled beaker. Lastly, we watched and recorded the reaction.

All cells contain membranes that are selectively permeable, allowing certain things to pass into and leave out of the cell. The process in which molecules of a substance move from an area of high concentration to areas of low concentration is called Diffusion. Whereas Osmosis is the process in which water crosses membranes from regions of high water concentration to areas with low water concentration. While molecules in diffusion move down a concentration gradient, molecules during osmosis both move down a concentration gradient as well as across it. Both diffusion, and osmosis are types of passive transport, which do not require help.

1 mL of 0.5 M NaOH solution was added to the beaker with the 25 mL of the buffer and

Diffusion is defined as the movement of molecules or ions from an area of a higher concentration to an area where they are in lower concentration. The driving force for diffusion is kinetic energy. The speed of diffusion is influenced by the molecular, temperature, bumping & bouncing off each other creating equilibrium in the molecules. The atoms & molecules are the building blocks of cells. Cells have selectively permeable membranes that only allow the movement of certain solutes or solutions. Diffusion is key to the functions in a cell. Diffusion helps to transport nutrients to cells in the body or plants. Water is an example of this movement like absorption of water into roots.

Research Question: How does the size of the cell affect its efficiency in exchanging substances through several ways, like diffusion?

A cell needs to perform diffusion in order to survive. Substances, including water, ions, and molecules that are required for cellular activities, can enter and leave cells by a passive process such as diffusion. Diffusion is random movement of molecules in a net direction from a region of higher concentration to a region of lower concentration order to reach equilibrium. Diffusion does not require any energy input. Diffusion is needed for basic cell functions - for example, in humans, cells obtain oxygen via diffusion from the alveoli of the lungs into the blood and in plants water

diffusion is one of the passive transport processes. it is used in oxygen entering a cell and carbon dioxide leaving a cell. diffusion is the movement of particles such as atoms or molecules from a high concentration place in an area of a low concentration. this shows that they diffuse down the concentration gradient. the concentration gradient is a gradual change in the concentration of solutes in a solution as a function of distance through a solution. in biology a gradient results from an unequal distribution of particles across the cell membrane. When this happens solutes move along the concentration gradient until the concentration of the

The purpose of this lab was for the student to get involved with his or hers new lab kit as well as being able to know, identify and use each other tools provided in the kit. Another key learning aspect of this lab is to teach the student how to measure properly the many units in the SI system. I will be using laboratory dilutions, measurements, and weights to then calculate using algebraic formula.

|MSA Agar |For organisms that are |Isolates for mannitol fermentation |Yellow color change in |Staphylococcus aureus |

The Graduated cylinders were used to find the volume of the solids and the liquids that were used is this lab.

Repeat this process with differing times of stirring the enzyme before adding sulfuric acid: 30 seconds, 60 seconds, 90 seconds, 120 seconds, and 180 seconds. Record the initial and final volumes of the syringe contents each time in the appropriate table.

1) Separate the solid from the liquid in the beaker by decanting the liquid. Ask your instructor to demonstrate the correct procedure.

Start the experiment by taking 3 agar cubes containing pH-indicator dye phenolphthalein, and have the teacher cut three different cubes each with different measures; a cube measured 3cmx3cmx3cm, another 2cmx2cmx2cm, and another 1cmx1cmx1cm. (The agar cubes are acting as artificial cells for this experiment). Place each agar cube in the solution of vinegar and water, and start the stopwatch as soon as the cubes hit the water. Stop the stopwatch as soon as the smallest cube becomes fully clear and record how much time it took for the physical property to completely change. The agar cube is supposed to change color from pink to white, the phenolphthalein dye gives the agar cube the pink color. The purpose of this experiment is to test the relationship

The identification of unknown organisms carries important ramifications that can be applied to many real world scenarios. In keeping with quality assurance beverages, food, cosmetics, and other products are frequently inspected for contaminants resulting from a presence of pathogenic bacteria. In medicine, a physician’s diagnosis and consequent treatment is largely determined from samples collected from infection sites that have been analyzed using microbial tests.

First I gather all my materials needed for the experiment (see materials list). Second I peel and slice potatoes weigh each potato in grams. Get these slices to weigh the same in mass because if they vary to much in mass that could affect the results of the experiment. Third I place each potato in its own beaker. Fourth once the potatoes are placed in beakers I make sure to place enough solution to fully cover the potato. Each beaker should have a different amount of