A protein molecule is approximately 8.0×103 pm8.0\times10^{3}\,\mathrm{pm}8.0×103pm wide. A cell is approximately 2.0 × 10-2 mm wide.
Approximately how many of these molecules would fit in a straight line across the cell, with no gaps or overlaps?
2.5×1022.5\times10^{2}2.5×102
2.5×1032.5\times10^{3}2.5×103
4.0×1034.0\times10^{3}4.0×103
4.0×1024.0\times10^{2}4.0×102
48 exam-style questions on Edexcel GCSE Biology 1.2 Number, size and scale, covering 1.2.1 Number, size and scale with estimations and 1.2.2 Quantitative units in relation to cells. Each one has a worked solution and a mark scheme showing where the marks go.