A-Level Edexcel Biology Powers and Logarithms

Review A-Level Edexcel Biology powers, exponentials and logarithms through the available data-table calculation using logarithmic or exponential relationships.

Exam points

use a logarithmic or exponential equation to complete missing values in a biological data table

[Maximum number: 2]

Gel electrophoresis is used to separate DNA fragments of different lengths.
The rate at which the DNA fragments move through the gel depends on several factors including:
- molecular size of the DNA fragment
- shape of the DNA fragment
- concentration of the gel.

Fragments of double-stranded DNA move through the gel at a relative rate ( $\mathrm{M}_{\mathrm{r}}$ ) that is inversely proportional to the log of their molecular weight (MW).

Complete the table using the equation:

M_{r}=\frac{1}{\log _{10} M W}

Table for Question A.0.5—Powers, exponentials and logarithms question 1 — Edexcel A-Level Biology A2

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A.0.5—Powers, exponentials and logarithms question 1