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WorksheetsBio - Cells, Movement of Subst and Bio Molecules
Total questions: 22
Worksheet time: 12mins
The diagram shows a section through a leaf. What is Q?
cell
tissue
organ
organ system
The diagram shows a section through a leaf. What is R?
cell
tissue
organ
organ system
The diagram shows a section through a leaf. What is S?
cell
tissue
organ
organ system
The diagram shows a liver cell. Which of the labelled structures are also found in a root hair cell of a plant?
Z
X and Y
X and Z
X, Y and Z
The diagram shows a cell from a leaf. Which part of the cell traps light energy for photosynthesis?
A
B
C
D
The diagram shows a plant cell. For which function is the cell modified?
absorption of water
photosynthesis
storage of food
support
How does most carbon dioxide reach the photosynthesizing cells of a green leaf?
diffusion through the epidermis of the leaf
diffusion through the stomata of the leaf
movement through the phloem
movement through the xylem
The diagram shows the movement of dissolved gases between the blood and body cells. By which process do the dissolved gases move?
absorption
diffusion
osmosis
respiration
Why has the starch suspension changed colour?
Iodine has diffused in through the membrane.
Iodine has diffused out through the membrane.
Starch has diffused in through the membrane.
Starch has diffused out through the membrane.
Gases pass between the atmosphere, the leaf air spaces and the cells of a leaf.A Which arrow on the diagram shows the net diffusion of oxygen when a leaf is exposed to bright sunlight?
A
B
C
D
Which statement is true of osmosis?
net movement of solute molecules from a region of high concentration to a region of low concentration
net movement of solute molecules from a region of low concentration to a region of high concentration
net movement of water molecules from a region of high water potential to a region of low water potential
net movement of water molecules from a region of low water potential to a region of high water potential
The diagrams show a cell in solution X and the same cell after it had been in solution Y for 20 minutes. What caused the change and what was the relative water potential of the cell sap to solution Y?
cell sap has higher water potential than solution Y,
water molecules move out of the cell by osmosis
cell sap has lower water potential than solution Y,
water molecules move into the cell by osmosis
cell sap has higher water potential than solution Y,
water molecules move into the cell by diffusion
cell sap has lower water potential than solution Y,
water molecules move into the cell by diffusion
Biuret is used to test for the presence of proteins. Which colour change shows the presence of proteins?
blue to orange-red
blue to purple
orange-red to blue
purple to blue
A food substance is tested with three reagents.
• iodine solution gives a blue-black colour
• the biuret test gives a purple colour
• the ethanol test gives an emulsion
What does this food substance contain?
protein and fat
starch and protein
fat
starch, protein and fat
Glycogen is a large molecule made up of small units.
Which represents part of a glycogen molecule?
A
B
C
D
Which substance is used to synthesise proteins?
amino acids
fatty acids
glucose
glycerol
Using the lock and key hypothesis of enzyme action, which diagram shows the shape of the only food molecule that this enzyme can break down?
Which statement is true for an enzyme?
It absorbs the sun's energy during photosynthesis.
It catalyses biological reactions.
It is destroyed by temperatures below 20 °C.
It slows down reactions in a cell.
The graph illustrates changes in the rate of an enzyme-controlled reaction with increasing temperature. Which line correctly continues the graph after 40°C?
A
B
C
D
The graph shows the effect of temperature on the time taken for the complete digestion of starch. At which temperature is the rate of digestion of starch the greatest?
10°C
30°C
40°C
50°C
The graph shows the effect of pH on the rate of reaction of three different enzymes. What does the graph show?
Each enzyme works best at a different pH.
Each enzyme works best over a small temperature range.
These enzymes work best in acid conditions.
These enzymes work best in alkaline conditions.
The diagram shows an enzyme and its substrate. Which statement(s) is/are correct?
1. Heating enzymes above 50°C changes the shape of their active sites.
2. The substrate has a shape which fits into the enzyme.
3. The substrate becomes permanently attached to the enzyme.
1 only
3 only
1 and 2
2 and 3
