A-Level CAIE Biology AS 2.1 Testing for Biological Molecules Question Bank

Lipase is an enzyme with many commercial uses. Some species of bacteria are of great interest as they produce large quantities of lipase.

The size of the measles virus is approximately 150 nm .
The Mimivirus is approximately 4.5 times larger than the measles virus, whilst the Pandoravirus is approximately 1.5 times larger than the Mimivirus.

Which viruses can be seen using both a light microscope with a maximum resolution of $0.25 \mu \mathrm{~m}$ and an electron microscope?

Tests on four samples from a mixture of biological molecules gave the results shown in the table.

Which biological molecules were in the mixture?

After boiling a sample of milk with Benedict's solution, a yellow colour is observed.
Which conclusion about the sample of milk is correct?

Steps 1-4 are used to test for a non-reducing sugar.
1 Put $5 \mathrm{~cm}^{3}$ of solution into a test-tube.
2 Add a few drops of acid.
3 Neutralise with alkali.
4 Add $6 \mathrm{~cm}^{3}$ Benedict's solution.
When is the solution boiled?

The diagram shows some similarities between chloroplasts, mitochondria and typical prokaryotes.

Which row is correct?

The diagram shows the results of a number of tests on a solution of biochemicals.

Which substances are present in the solution?

The table shows the observations recorded from tests for biological molecules on four samples, A, B, C and D.

Which conclusion is correct?

Two solutions, 1 and 2, one containing starch and sucrose, and the other containing glucose and protein, were tested with a variety of reagents to confirm their identity.

The table shows the conclusions from the results recorded for the various tests.
Which row identifies the two solutions?