Name: ________________________
3.1.2 Carbohydrates Class: ________________________
Date: ________________________
Time:
Marks:
Comments:
Page 1 of 31
, (a) The letters P, Q, R, S and T represent ways substances can move across membranes.
1
• P – diffusion through the phospholipid bilayer
• Q – facilitated diffusion
• R – active transport
• S – co-transport
• T – osmosis
For each of the following examples of transport across membranes, select the letter that
represents the way in which the substance moves across the membrane.
Write the appropriate letter in each box provided.
Transport through a channel protein
Transport of small, non-polar molecules
Transport of glucose with sodium ions
(3)
Page 2 of 31
,The diagram shows how a plant cell produces its cell wall.
(b) Y is a protein. One function of Y is to transport cellulose molecules across the phospholipid
bilayer.
Using information from the diagram, describe the other function of Y.
.............................................................................................................................
.............................................................................................................................
.............................................................................................................................
.............................................................................................................................
.............................................................................................................................
(2)
(c) What is the evidence in the diagram that the phospholipid bilayer shown is part of the
cell-surface membrane?
.............................................................................................................................
.............................................................................................................................
(1)
Page 3 of 31
, (d) In the cell wall, bonds hold the cellulose molecules together side by side.
Tick (✔) one box that describes the type of bond that holds the cellulose molecules
together side by side.
Ester
Hydrogen
Ionic
Peptide
(1)
(Total 7 marks)
The diagrams show four types of linkage, A to D, which occur in biological molecules.
2
(a) Name the chemical process involved in the formation of linkage B.
......................................................................................................................
(1)
Page 4 of 31
3.1.2 Carbohydrates Class: ________________________
Date: ________________________
Time:
Marks:
Comments:
Page 1 of 31
, (a) The letters P, Q, R, S and T represent ways substances can move across membranes.
1
• P – diffusion through the phospholipid bilayer
• Q – facilitated diffusion
• R – active transport
• S – co-transport
• T – osmosis
For each of the following examples of transport across membranes, select the letter that
represents the way in which the substance moves across the membrane.
Write the appropriate letter in each box provided.
Transport through a channel protein
Transport of small, non-polar molecules
Transport of glucose with sodium ions
(3)
Page 2 of 31
,The diagram shows how a plant cell produces its cell wall.
(b) Y is a protein. One function of Y is to transport cellulose molecules across the phospholipid
bilayer.
Using information from the diagram, describe the other function of Y.
.............................................................................................................................
.............................................................................................................................
.............................................................................................................................
.............................................................................................................................
.............................................................................................................................
(2)
(c) What is the evidence in the diagram that the phospholipid bilayer shown is part of the
cell-surface membrane?
.............................................................................................................................
.............................................................................................................................
(1)
Page 3 of 31
, (d) In the cell wall, bonds hold the cellulose molecules together side by side.
Tick (✔) one box that describes the type of bond that holds the cellulose molecules
together side by side.
Ester
Hydrogen
Ionic
Peptide
(1)
(Total 7 marks)
The diagrams show four types of linkage, A to D, which occur in biological molecules.
2
(a) Name the chemical process involved in the formation of linkage B.
......................................................................................................................
(1)
Page 4 of 31
