ConceptConceptDocsDocuments

Edexcel A-Level Biology Algebra Skills

Practise Edexcel A-Level Biology algebra skills through BMI rearrangement, cardiac index units, enzyme-rate formulae and physiological calculations.

Syllabus
Pearson Edexcel International Advanced Subsidiary/Advanced Level
Course
Biology XBI11/YBI11
Level
AS

Exam points

  • rearrange BMI or cardiac-output formulae before substituting biological measurements
  • calculate cardiac index, heart rate or MAP while preserving compound units
  • substitute graph-read Vmax and K values into enzyme-rate formulae accurately

Covered syllabus points

A.2.1—Mathematical symbolsA.2.2—Changing the subject of an equationA.2.3—Substitution into algebraic equationsA.2.4—Solving algebraic equations

A.2 Algebra question 1

[Maximum number: 3]

Obesity increases the risk of cardiovascular disease (CVD).
Body mass index (BMI), waist-to-hip ratio (WHR) and skinfold thickness are indicators of obesity.

The table shows some measurements taken from two females, female J and female K.

Table for Question A.2 Algebra question 1 — Edexcel A-Level Biology AS

The formula for calculating BMI is:

BMI= mass in kg( height in m)2\mathrm{BMI}=\frac{\text { mass in } \mathrm{kg}}{(\text { height in } \mathrm{m})^{2}}

Calculate the mass of female K, using the data in the table.

A.2 Algebra question 2

[Maximum number: 1]

Obesity indicators are used to assess the risk of cardiovascular disease (CVD), including coronary heart disease (CHD). Obesity indicators include body mass index (BMI) and waist-to-hip ratio (WHR).

A woman who was 165 cm tall had a mass of 68 kg , a waist circumference of 85 cm and a hip measurement of 101 cm .

Calculate the BMI of this woman. Use the formula:

BMI= mass in kg( height in m)2\mathrm{BMI}=\frac{\text { mass in } \mathrm{kg}}{(\text { height in } \mathrm{m})^{2}}

Answer

All question bank results loaded