Practise Edexcel A-Level Biology handling data through magnification calculations, graph and table conclusions, correlation comments and statistical-test decisions.
Human serum albumin is a globular protein found in blood plasma.
Albumin has a molecular mass of 66300 daltons.
It consists of 585 amino acids.
At pH 7.4 albumin has over 200 negative charges on the surface of each molecule.
Calculate the mean molecular mass of an amino acid in albumin.
Give your answer to an appropriate number of significant figures.
Light is essential for photosynthesis.
The photograph shows thale cress, a small flowering plant found in Europe, Asia and Africa.
The effect of wavelength of light on thale cress was investigated. Three groups of plants were treated with a different wavelength of light. One group of plants was treated with blue light, one group with amber light and one group with red light. The following were measured: - rate of photosynthesis - leaf biomass - pigment content of the leaves - changes in transcription of genes in the leaves. Another group of these plants had a control light shone on them.
The table shows the results for the pigment content of the leaves.
Describe three conclusions that can be made from these results.
Quince are fruit that grow on trees.
When a quince falls from the tree, two processes take place: browning and decomposition.
A quince fruit is made up of cells and contains a lot of juice.
The table shows the composition of carbohydrates in the juice of one species of quince.
Which row of the table shows the carbohydrates with the median concentration and modal concentration in quince juice?
□ A
□ B
□ C
□ D