AQA A-Level Biology CH5. Transport Across Membranes

Suggest a function/s of the membrane surrounding the chloroplasts?

• to keep the enzymes needed for photosynthesis all in one place

• controls the release of ATP from the organelle

• making photosynthetic reactions more efficient

• to compartmentalise photosynthesis

Suggest a function/s for the membrane surrounding a bacterial cell.

• to stop WBC's from entering and destroying the bacterial cell

• to control what substances enter and leave the cell

• to enable cell signalling

• making photosynthetic reactions more efficient

A model was suggested to describe the arrangement of the molecules in a membrane. What is the name of this model?

• Magic Fluid Model

• Mosaic Fluid Model

• Fluid Mosaic Model

• Phospholipid Mosaic Model

Proteins are scattered through the bilayer, like tiles in a mosaic. What is label B known as?

• peripheral protein

• glycoprotein

• carrier protein

• channel protein

Proteins are scattered through the bilayer, like tiles in a mosaic. What is label E known as?

• peripheral protein

• channel protein

• carrier protein

• glycoprotein

Write the name for the receptor protein on the cell-surface membrane (label F)

Which two molecules make up the cell membrane?

• Protein and Lipids

• Protein and Phospholipids

• Starch and Protein

• Protein and Glucose

Which label identifies the peripheral protein?

• B

• C

• D

• E

Phospholipids form a barrier to dissolved substances. They have a 'head' and 'tail'? What is label G?

• Head - hydrophilic

• Head - hydrophobic

• Tail - hydrophilic

• Tail - hydrophobic

Phospholipids form a barrier to dissolved substances. They have a 'head' and 'tail'? What is label H?

• Head - hydrophilic

• Head - hydrophobic

• Tail - hydrophilic

• Tail - hydrophobic