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Broad Topics > Applications > biology

### Extreme Dissociation

##### Stage: 5 Challenge Level:

In this question we push the pH formula to its theoretical limits.

### Ph Temperature

##### Stage: 5 Challenge Level:

At what temperature is the pH of water exactly 7?

### Concentrations

##### Stage: 5 Challenge Level:

Use the interactivity to practise your skills with concentrations and molarity.

### Population Dynamics

##### Stage: 5 Challenge Level:

This problem opens a major sequence of activities on the mathematics of population dynamics for advanced students.

### Genetic Intrigue

##### Stage: 5

Dip your toe into the fascinating topic of genetics. From Mendel's theories to some cutting edge experimental techniques, this article gives an insight into some of the processes underlying. . . .

### Mixing Ph

##### Stage: 5 Challenge Level:

Use the logarithm to work out these pH values

### Blood Buffers

##### Stage: 5 Challenge Level:

Investigate the mathematics behind blood buffers and derive the form of a titration curve.

### Whose Line Graph Is it Anyway?

##### Stage: 5 Challenge Level:

Which line graph, equations and physical processes go together?

### Approximately Certain

##### Stage: 4 and 5 Challenge Level:

Estimate these curious quantities sufficiently accurately that you can rank them in order of size

### Conversion Sorter

##### Stage: 4 Challenge Level:

Can you break down this conversion process into logical steps?

### A Question of Scale

##### Stage: 4 Challenge Level:

Use your skill and knowledge to place various scientific lengths in order of size. Can you judge the length of objects with sizes ranging from 1 Angstrom to 1 million km with no wrong attempts?

### Bigger or Smaller?

##### Stage: 4 Challenge Level:

When you change the units, do the numbers get bigger or smaller?

### Dilution Series Calculator

##### Stage: 4 Challenge Level:

Which dilutions can you make using 10ml pipettes and 100ml measuring cylinders?

### Light Absorbance

##### Stage: 5 Challenge Level:

Test your skills at this light-absorbance calculation.

### Why Multiply When You're about to Divide?

##### Stage: 5 Challenge Level:

A brief introduction to PCR and restriction mapping, with relevant calculations...

### Core Scientific Mathematics

##### Stage: 4 and 5 Challenge Level:

This is the area of the advanced stemNRICH site devoted to the core applied mathematics underlying the sciences.

### Drug Stabiliser

##### Stage: 5 Challenge Level:

How does the half-life of a drug affect the build up of medication in the body over time?

### Population Dynamics - Part 6

##### Stage: 5 Challenge Level:

Sixth in our series of problems on population dynamics for advanced students.

### Population Dynamics - Part 1

##### Stage: 5 Challenge Level:

First in our series of problems on population dynamics for advanced students.

### Population Dynamics - Part 4

##### Stage: 5 Challenge Level:

Fourth in our series of problems on population dynamics for advanced students.

### Population Ecology Using Probability

##### Stage: 5 Challenge Level:

An advanced mathematical exploration supporting our series of articles on population dynamics for advanced students.

### Investigating the Dilution Series

##### Stage: 4 Challenge Level:

Which dilutions can you make using only 10ml pipettes?

##### Stage: 4 Challenge Level:

Which units would you choose best to fit these situations?

### Catalyse That!

##### Stage: 5 Challenge Level:

Can you work out how to produce the right amount of chemical in a temperature-dependent reaction?

### Population Dynamics - Part 2

##### Stage: 5 Challenge Level:

Second in our series of problems on population dynamics for advanced students.

### Population Dynamics Collection

##### Stage: 5 Challenge Level:

This is our collection of tasks on the mathematical theme of 'Population Dynamics' for advanced students and those interested in mathematical modelling.

### Population Dynamics - Part 3

##### Stage: 5 Challenge Level:

Third in our series of problems on population dynamics for advanced students.

### Population Dynamics - Part 5

##### Stage: 5 Challenge Level:

Fifth in our series of problems on population dynamics for advanced students.

### Real-life Equations

##### Stage: 5 Challenge Level:

Here are several equations from real life. Can you work out which measurements are possible from each equation?

### Mixed up Mixture

##### Stage: 4 Challenge Level:

Can you fill in the mixed up numbers in this dilution calculation?

### Ratios and Dilutions

##### Stage: 4 Challenge Level:

Scientists often require solutions which are diluted to a particular concentration. In this problem, you can explore the mathematics of simple dilutions

### Branching Processes and Extinction

##### Stage: 5 Challenge Level:

An advanced mathematical exploration supporting our series of articles on population dynamics for advanced students.

### Neural Nets

##### Stage: 5

Find out some of the mathematics behind neural networks.

### Reaction Types

##### Stage: 5 Challenge Level:

Explore the rates of growth of the sorts of simple polynomials often used in mathematical modelling.

### Chi-squared Faker

##### Stage: 5 Challenge Level:

How would you massage the data in this Chi-squared test to both accept and reject the hypothesis?

### Exact Dilutions

##### Stage: 4 Challenge Level:

Which exact dilution ratios can you make using only 2 dilutions?

### Predator - Prey Systems

##### Stage: 5 Challenge Level:

See how differential equations might be used to make a realistic model of a system containing predators and their prey.

### Stats Statements

##### Stage: 5 Challenge Level:

Are these statistical statements sometimes, always or never true? Or it is impossible to say?

### Chemnrich

##### Stage: 4 and 5 Challenge Level:

chemNRICH is the area of the stemNRICH site devoted to the mathematics underlying the study of chemistry, designed to help develop the mathematics required to get the most from your study. . . .

### The Genes of Gilgamesh

##### Stage: 4 Challenge Level:

Can you work out the parentage of the ancient hero Gilgamesh?

### Packing 3D Shapes

##### Stage: 4 Challenge Level:

What 3D shapes occur in nature. How efficiently can you pack these shapes together?

### Mathematical Issues for Biologists

##### Stage: 5 Challenge Level:

STEM students at university often encounter mathematical difficulties. This articles highlights the 8 key problems for biologists.

### Bionrich

##### Stage: 4 and 5 Challenge Level:

bioNRICH is the area of the stemNRICH site devoted to the mathematics underlying the study of the biological sciences, designed to help develop the mathematics required to get the most from your. . . .

### Very Old Man

##### Stage: 5 Challenge Level:

Is the age of this very old man statistically believable?

### Alternative Record Book

##### Stage: 4 and 5 Challenge Level:

In which Olympic event does a human travel fastest? Decide which events to include in your Alternative Record Book.

##### Stage: 5 Challenge Level:

Use combinatoric probabilities to work out the probability that you are genetically unique!

### Robot Camera

##### Stage: 4 Challenge Level:

Could nanotechnology be used to see if an artery is blocked? Or is this just science fiction?

### Fitting Flat Shapes

##### Stage: 5 Challenge Level:

How efficiently can various flat shapes be fitted together?

### Graphic Biology

##### Stage: 5 Challenge Level:

Several graphs of the sort occurring commonly in biology are given. How many processes can you map to each graph?

### Epidemic Modelling

##### Stage: 4 and 5 Challenge Level:

Use the computer to model an epidemic. Try out public health policies to control the spread of the epidemic, to minimise the number of sick days and deaths.