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

Diffusion and cell size

Extracts from this document...


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.


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.


* 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

See related essaysSee related essays

Related International Baccalaureate Biology essays

  1. Marked by a teacher

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

    Focusing the cells into view consumed lots of time at the beginning of the lab. When my partner and I were first observing the onion root tip cell, we couldn't find the cells and it took us quite a long time to put them into view.

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

    Volume of HCL + Concentration of HCL - there has to be enough HCL in the beaker so that the agar cube is completely covered each time (50cm3) and the concentration of the HCL is 0.1 M Source of agar - each agar cube that you cut should be from

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

    150 : 125 = 1.2 : 1.0 5. 100 : 62.5 = 1.6 : 1.0 Example calculation for time taken for agar blocks to decolourise * Data obtained from Table 1.2, agar block number 1. s Graph 1.1: Averaged time taken for agar blocks to decolourise Conclusion From the results obtained above, it is agreed that a larger

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

    When the cells are large, the cell membrane creates a strong barrier against the substance, which makes it difficult for diffusion to take place. Evaluation: The line of best fit did not pass through the origin because we assumed that the agar and the sodium would be uniformly dense however, they could be heavier.

  2. IB Genetic Unit Notes

    These plasmids can be removed and cleaved by restriction enzymes at target sequences. DNA fragments from another organism can also be cleaved by the same restriction enzyme, and these pieces can be added to the open plasmid and spliced together by ligase.

  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 the relationship between diffusion and Size of the Cell

    And two agar cubes of 0.5cm by 0.5cm. 3) Collect four test tubes and place one agar cube into each test tube. 4) Obtain the stopwatch 5) Pour the acid into one test tube and start the stopwatch after five seconds add the acid into the next test tube, again

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