Fluid mosaic membrane

Which molecules have a structural formula that contains C=O bonds?

1 amino acid

2 fatty acid

3 glycerol

4 protein

• 1, 2 and 3

• 1, 2 and 4

• 1, 3 and 4

• 2, 3 and 4

What is the correct range of measurements for the width of the cell surface membrane?

• 0.5–1.0 nm

• 5-10 nm

• 50-100 nm

• 0.5-1.0 μm

Where in the cell surface membrane are the carbohydrate chains of glycoproteins and glycolipids mainly located?

• A

• B

• C

• D

Two solutions, 1 and 2, each contained a mix of two different biological molecules. One solution contained starch and sucrose, and the other contained glucose and protein. The two solutions were tested with a variety of reagents to identify the presence of the biological molecules in the solution. The table shows the results recorded for the various tests. Which row identifies the two solutions?

• a

• b

• c

• D

Which statement is correct for a non-competitive inhibitor?

• The inhibitor binds to the active site of the enzyme and decreases Vmax.

• The inhibitor binds away from the active site and increases the Michaelis–Menten constant.

• The inhibitor decreases Vmax, but the Michaelis–Menten constant does not change.

• The inhibitor does not change Vmax but increases the Michaelis–Menten constant.

The diagram shows part of a cell surface membrane. Which row correctly identifies the molecules labelled 1 and 2?

• a

• b

• c

• D