State the width of a typical cell membrane / phospholipid bilayer. 

• 7 mm

• 7 nm

• 7 um

• 7 cm

State the purpose of using methylene blue on the onion cell slide. [1]

• to see the cell

• to dye the cell, to see nucleus

• to stain the cell, to make structure visible

• to colour cell

State why triglycerides and phospholipids cannot be described as polymers.

• not compose of repeating units/ monomers
• cannot break down by hydrolysis

• cannot break down by condensation

• not the same group of biological molecules

Name the parts of the amino acid molecule labelled A and B in the diagram.

• A- amino group, B- carboxyl group

• A- carboxyl group, B- amino group

• A- hydroxyl group, B- amide group

Name the reaction to break down peptide bond in a protein.

• denaturation

• condensation

• hydrolysis

• anabolic reaction

Define what is meant by the term fluid mosaic.

Fluid refers to ___________ moves laterally.

Mosaic refers to ___________ scatter in phospholipid bilayer.

Define the term antigen.

Any substance that is ......................... and stimulates an ...................... .............................

Identify features of cell surface membranes of eukaryotic cells that are not visible in the diagram.

• protein

• phospholipids

• cholesterol

• glycolipids

List organelles which contain DNA.

• ribosome

• nucleus

• mitochondria

• choloplast

Name the method to produce monoclonal antibodies.