• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2

# Diffusion and cell size

Extracts from this document...

Introduction

Diffusion and cell size Side of cube / cm � 0.05 cm Surface area / cm2 � 0.05 cm2 Volume / cm3 � 0.05 cm3 Distance penetrated / cm � 0.05 cm Distance not penetrated / cm � 0.05 cm Volume not penetrated / cm3 � 0.05 cm3 % of the total volume not penetrated 1 6 1 6:1 1 � � � 2 24 8 3:1 0.5 1 1 12.5 3 54 27 2:1 0.5 2 8 29.6 Discussion questions and answers * List the agar cubes in order of size, from largest to smallest. List them in order of surface area - to - volume ratio, from largest to smallest ratio. How does these lists compare? From largest to smallest in order of size: 3 cm, 2 cm, 1 cm. ...read more.

Middle

This change was slightly stronger in the beaker containing the largest agar block. Thus, this gives an indication that phenolphthalein was diffusing out from the agar block and into the sodium hydroxide solution. * What happens to the surface area - to - volume ratio of a cell as the cell grows? When a cell increases in size the surface area - to - volume ratio will decrease in order to bring in essential materials more easily as well as carrying out waste more effectively. * When one cube-shaped cell divides into two equal parts, how does the volume of each small cell compare with the one large cell? Does the surface area change in the same proportion? Explain. When the cell divides, the volume will remain the same due to the new cell being an exact copy of the cell which it was divided from. ...read more.

Conclusion

* What does the surface area of the cube represent? The surface area of the cube represents the rate at which different materials enter or leave the cell. This includes essential nutrients entering the cell and waste products exiting the cell. A cell with a larger surface area per unit volume is able to move more materials in and out of the cell. From the table above it can be concluded that the agar block with 1 cm sides, have the largest surface area per unit volume, thus is able to transport a larger amount of materials in and out of the cell. * What does the volume of the cube represent? The volume of the cube implies the rate at which different materials are used or produced, such as the production of heat and waste and the rate of consuming resources. ?? ?? ?? ?? Nathalie Zheng IB2 Biology HL 20100924 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related International Baccalaureate Biology essays

1. ## Investigating the relationship between cell size and rate of diffusion

2.Pour in NaOH into 3 beakers, enough to cover each cube in the solution completely.Immerse all cubes in NaOH at the same time, and record the time.

2. ## Modelling Surface Area to Volume Ratio in Cells with Agar Cubes

blocks but when the surface area / volume ratio goes up, it will take less time for the hydrochloric acid to reach the centre of the cube. Variables Controlled Variables: Temperature - thermostatically controlled room Time - the length of time you leave the cubes in the HCL (6 minutes)

1. ## Surface Area to Volume Ratio Simulation Experiment. The comparison between surface area : volume ...

5mm � 5mm � 5mm = 125mm3 5. 2.5mm � 5mm � 5mm = 62.5mm3 Calculations for surface area to volume ratio: 1. 600 : 1000 = 0.6 : 1.0 2. 400 : 500 = 0.8 : 1.0 3. 250 : 250 = 1.0 : 1.0 4. 150 : 125 = 1.2 : 1.0 5.

2. ## Biology Lab - frequency of cell division in animal and plant cell

Class was divided into pairs and they each drew the diagrams of the process of mitosis of each stage. All students in the class recorded the data which was needed to calculate the field of view, drawing of fit and calculated the magnification.

1. ## Biology Cell biology

The time that it takes for the hydrolysis to fully complete the transferral conjunction with the temperature can be used to find the rate of reaction. From this is can be calculated at which temperature the enzyme amylase is most effective.

2. ## Investigating Surface Area to Volume Ratio concerning the rate of Diffusion

As the cell size increases, its volume increases faster than the surface area. The size of the agar cube played a significant role in this experiment because the larger the cube, the harder it was for the sodium hydroxide to diffuse.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to