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

Modelling Surface Area to Volume Ratio in Cells with Agar Cubes

Extracts from this document...


MODELLING SURFACE AREA TO VOLUME RATIO IN CELLS Research Question To investigate the effect of increasing the SA:V ratio on the percentage of penetration of HCL, when cubes of bromothymol blue agar are placed in the HCL. (Concentration of the HCL --> 0.1 M) Background Info A cell needs a large surface area in order to carry out metabolic functions (as chemical reactions require a surface). As a cell grows, it needs to carry out more and more reactions. Therefore, since a cell has to maintain a certain surface area to volume ratio, its size is limited. (http://en.wikibooks.org/wiki/IB_Biology/Cells) The surface area to volume ratio in living organisms is very important. Nutrients and oxygen need to diffuse through the cell membrane and into the cells. Most cells are no longer than 1mm in diameter because small cells enable nutrients and oxygen to diffuse into the cell quickly and allow waste to diffuse out of the cell quickly. If the cells were any bigger than this then it would take too long for the nutrients and oxygen to diffuse into the cell so the cell would probably not survive. ...read more.


Surface Area: Volume Ratio Volume of Bromothymol Blue Agar COLOURED (un-penetrated) (cm3 +/- 1mm) Trial 1 Trial 2 Trial 3 Trial 4 2:1 (3cm) 4.91 3.38 8.00 3.38 3:1 (2cm) 0.51 0.13 1.00 0.34 6:1 (1cm) 0.00 0.00 0.00 0.00 Table 3 The mean penetration percentage (%) and standard deviation of hydrochloric acid (HCL-0.1M) when cubes of bromothymol blue agar (side lengths 3cm, 2cm, 1cm) with increasing surface area to volume ratio's (2:1, 3:1, 6:1) are placed into the acid for a period of 6 minutes. Surface Area: Volume Ratio Mean of the percentage of cube uncolored (%) Standard Deviation (3 significant figures) 2:1 (3cm) 81.8 8.06 3:1 (2cm) 93.8 4.64 6:1 (1cm) 100.0 0.00 Qualitative data: table 7 - qualitative data from experiment Surface Area to Volume Ratio Qualitative Observations Trial 1 Trial 2 Trial 3 Trial 4 2:1 (3cm3 cube) * Minimal change observed in first minute. * Appears to be minimally penetrated by hydrochloric acid. * Solution had acidic odour * Remained constant throughout experiment * The cube was pale on the outside with a slight yellow/white tinge * The inside of the cube was a darker blue colour * Whitest on edges- almost transparent * Not much change occurred at first * During the third minute the penetration became more obvious however did not penetrate more that 1/4 of cube. ...read more.


When we were measuring and cutting the cubes, it was hard to be exact because the agar was quite flexible and so when you cut through it, it was hard to cut it straight and to get an exact cube. Also, when we were measuring the cube, not all the edges were straight on the cube and also we were using a regular 30cm ruler with and uncertainty of 1 mm, so it was hard to be exact with our measurements. In the future, we could use set molds to increase the uniformity of the cubes and increase the exactness and straightness of all the sides. The original big block of agar we received was also not consistently blue all the way through to start with which indicated that the bromothymol blue wasn't consistently distributed or maybe a reaction had occurred between the agar and the air. However, when we cut our 3 different sizes of agar cubes, we still had a lot of agar left over so in the future, we would try to choose an area of the agar which was more consistently blue (therefore indicating that the bromothymol blue is more evenly distributed through the agar) and use that area to create our different sized cubes. ...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. Biology IA - Investigation of the relationship between surface area and volume using different ...

    Finally, the experiment is replicated with 5 same size cubes. Data collection and processing 4 cubes of a wall of 1, 2, 3 and 4 cm length and one rhomb 1x2x4 cm were cut. They were put into the excess of NaOH solution and kept there for 10min.

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

    1 0.6 : 1.0 3332.20 2 0.8 : 1.0 2812.36 3 1.0 : 1.0 2225.24 4 1.2 : 1.0 1784.28 5 1.6 : 1.0 1459.12 Data Processing Calculations for surface area of agar blocks: 1. 10mm � 10mm � 6 = 600mm2 2.

  1. IB Genetic Unit Notes

    has the recessive allele XH Xh - The term carrier can be applied to any individual that is heterozygous for a recessive

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

    - Next, remove the agar cubes from the beakers and place them onto a dry surface. - Measure the penetrated part of the cube (pink color) with a ruler. Then calculate the percentage. - Record your results and repeat the procedure for the other agar cubes.

  1. Methods of estimating population sizes.

    The total number of crosses found was 80 which will be divided between: i) the average number of crosses per throw = 80 crosses / 1.2642 m2 =63.282 crosses per m2 ii) The number of throws to find an average of crosses per throw/quadrat .

  2. An investigation on the changes in tidal volume and vital capacity of lungs before ...

    Inhale normally. Put mouthpiece in mouth and exhale normally. . Repeat 3 more times. Measure volume and record as tidal volume. 5. Inhale as deeply as possible. Put mouthpiece in mouth and exhale as much air as possible. Repeat 2 more times. Measure volume and record as vital capacity.

  1. Bionics and Prosthetics - the future possibilities.

    Bionics is the science of replacing biology with machine. Todd Kuiken, an expert on bionic prosthetics, describes bionics as ?the stuff of life meets machine?. This field has many practical advantages including advanced rehabilitation for amputee?s. By combining the knowledge of the human circuitry and machine circuitry, neuroprosthetics allows for more natural replacement limbs.

  2. Overview of Cells & Energy (Revision)

    A tissue is an integrated group oi cells that have a common structure and function. An organ is a center of the body composed of several different types of tissue and carries out a bodily function. An organ system is a group of organs the specialize in a certian function together.

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