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WorksheetsC4&5 - Biological Molecules (5078)
Total questions: 10
Worksheet time: 6mins
Which of this is a role of water in living organisms?
an energy source
buoyancy (allowing organisms to float/sink)
insulation
transport
What are the subunits of a protein molecule?
amino acid
fatty acid
glucose
glycerol
A food substance is tested with three reagents. The results are:
- iodine solution turns blue-black
- biuret test gives a purple colour
- ethanol test gives an emulsion
What does the food substance contain?
starch
protein
fat
Which of these properties make water suitable to be used in a blood transport system?
Water cools a surface from which it evaporates.
Water is used as a solvent for many chemicals.
Water is involved in many metabolic reactions.
Which statement is true of enzymes?
They absorb the sun's energy during photosynthesis.
They catalyse biological reactions.
They are destroyed at temperatures below 20 °C.
They slow down reactions that occur in cells.
Which statement about enzymes is essential to the lock-and-key hypothesis?
Enzymes are catalysts.
Enzymes can be denatured by high pH values.
Enzymes can be denatured at high temperatures.
Enzymes have a distinct active site shape.
The diagrams represent the activity of an enzyme. What are the labelled structures?
A
B
C
D
Which statement(s) is/are correct?
Heating enzymes too high above optimum temperature changes the shape of their active sites.
An enzyme has the same shape as its substrate.
When a substrate binds to its enzyme, it becomes permanently attached.
The graph shows the results of an experiment on an enzyme-controlled reaction. Which statement explains the shape of the graph above 40 °C?
The enzyme-substrate complex does not separate.
The shape of the enzyme's active site is altered.
The substrate has been denatured by the heat.
The enzyme has not reached its optimum temperature.
The graph shows the rate of reaction of three different enzymes. Which conclusion can be made from the graph?
Each enzyme works best at a different pH.
Each enzyme works best over a small temperature range.
The enzymes work best in acidic conditions.
The enzymes work best in alkaline conditions.
