A-Level Edexcel Biology AS Units in Calculations

A-Level Edexcel Biology AS Units in Calculations
Pearson Edexcel International Advanced Subsidiary/Advanced Level in Biology, Issue 2, February 2021Biology XBI11/YBI11

Review A-Level Edexcel Biology units in calculations through mass, volume, length, energy, temperature and rate conversions in biological contexts.

How this is tested

  • convert biological measurements between cm, µm, cm^3 and dm^3 before calculating
  • use correct compound rate units such as nmol mg^-1 min^-1 in data questions
  • convert energy, mass or temperature values and round answers to stated precision

Question 1(e)

[Maximum number: 2]

The structure of a chloroplast is related to its role in photosynthesis. The diagram shows a chloroplast.

Figure for Question 1(e) — Edexcel A-Level Biology AS

The length of a cell was measured. It was found to be 0.0085 cm long. The ratio of the length of this cell to the length of a chloroplast was 11.7:1. Calculate the length of this chloroplast. Give your answer in μm\mu \mathrm{m} to 2 significant figures. Answer μm\mu \mathrm{m}