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Magnify-cent Biology!! IB Biology Topic 2

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Magnify-cent Biology!!. IB Biology Topic 2. Learning Outcomes. Everyone should : Compare relative sizes of biological molecules , viruses , cells and bacteria using appropritate SI units Most will : Calculate magnification from a scale bar Some might - PowerPoint PPT Presentation

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Magnify-cent Biology!!

Magnify-cent Biology!!IB Biology Topic 2

Learning OutcomesEveryone should:Compare relative sizes of biological molecules, viruses, cells and bacteria using appropritate SI units

Most will:Calculate magnification from a scale bar

Some mightCalculate magnification and actual size of biological drawings and specimens

Now try the Magnification Revision poster as a group!

Answers for the animal cellCalculate the magnification factorThe line 5 m is 20 mm long. So 20 000 m = 5 mMagnification is 20 000/5 = x 4 000.Calculate the length of structure GLength of G is 12 mm = 12 000 m Magnification is x 4 000Real size is 12 000/4000 = 3 mCalculate the diameter of structure BDiameter is 8 mm = 8 000 m Magnification is x 4 000Real size is 8 000/ 4 000 = 2m Calculate the diameter of the nucleusDiameter is 36 mm = 36 000 mMagnification is x 4 000so real size is 36 000/4 000 = 9 mCalculate the diameter of the cell at its widest point109 mm = 109 000 m = 109 000/4 000 = 2725 mFor all the answers above there is a tolerance limit of + or 0.5mm, so + or 0.1 0.2 mThere are other perfectly correct ways of doing the calculation, so if your method is different, but arrives at the correct answer, then that is fine.

Answers for the plant cellCalculate the magnification factor.The line representing 40 m is 25 mm or 25 000 m longTherefore, magnification factor is 25 000/40 = x 625.Calculate the thickness of the cellulose cell wall.Wall is 3.0 mm = 3 000 m Magnification is x 625Actual thickness of wall is 3 000/625 = 4.8 mCalculate the length of the cell.120 mm = 120 000 m magnification factor is x 625Actual length is 120 000/625 = 192 mCalculate the length of structure C.29 mm = 29 000 m magnification is x 625Actual length is 29 000/625 = 46.4 mCalculate the length of the vacuole.80 mm = 80 000 m magnification is x 625Actual length is 80 000/625 = 128 m.

Learning OutcomesEveryone should:Compare relative sizes of biological molecules, viruses, cells and bacteria using appropriate SI units

Most will:Calculate magnification from a scale bar

Some mightCalculate magnification and actual size of biological drawings and specimens