Theory

CH5 - ENZYMES

Two enzyme-controlled reactions are shown.[Image_1: amino acids --enzyme 1--> proteins; proteins --enzyme 2--> amino acids]From these reactions, what ...

2010 Winter

2

Theory

CH5 - ENZYMES

Six test-tubes were set up at different temperatures. Each contained identical solutions containing starch and amylase mixtures. The table shows the t...

2010 Winter

1

Theory

CH5 - ENZYMES

When solution X is tested with iodine solution, a blue-black colour is observed.A different solution, Y, is added to a new sample of solution X and th...

2012 Winter

1

Theory

CH5 - ENZYMES

The graph shows the effect of pH on the rate of reaction of three different enzymes. What does the graph show?A Each enzyme works best at a different ...

2012 Winter

1

Theory

CH5 - ENZYMES

What are enzymes made of?A carbohydratesB DNAC fatsD proteins

2011 Summer

2

Theory

CH5 - ENZYMES

At which temperature do most enzymes from the human body become completely denatured?A 0°CB 27°CC 40°CD 65°C

2011 Summer

2

Theory

CH5 - ENZYMES

A human digestive enzyme breaks down its substrate at a fast rate at 35°C.What would occur if the enzyme and substrate were kept at 75°C?A The enzym...

2011 Winter

3

Theory

CH5 - ENZYMES

Which graph shows the effect of temperature on the activity of a human digestive enzyme?

2009 Winter

2

Theory

CH5 - ENZYMES

The graph shows how the rate of an enzyme-controlled reaction changes with temperature.What is happening within the temperature range marked X?A The e...

2010 Summer

1

Theory

CH5 - ENZYMES

The diagram shows the action of amylase. What is the function of the enzyme amylase?A) breaks down the substrate into amino acidsB) changes the produc...

2011 Winter

3

MCQ

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

Some yeast, sugar and water are mixed in a test-tube. The diagrams show the test-tube at the start and after one hour. Which process causes this chan...

2016 Summer

3

MCQ

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

Which name is given to a group of individuals that can reproduce to produce fertile offspring?

2016 Summer

2

MCQ

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

Use the key to identify the animal shown in the diagram.

2016 Summer

2

MCQ

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

Which organelles are present in large numbers in cells that produce insulin?

2016 Summer

2

MCQ

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

The actual thickness of the leaf shown in the diagram is 2000 \mu m, but its thickness in the diagram is 50 mm. What is the magnification of the diag...

2016 Summer

2

MCQ

CH3 - MOVEMENT IN AND OUT OF CELLS

The diagram shows an experiment on osmosis. Which arrow shows the direction of the net movement of water at the start of the experiment?

2016 Summer

1

MCQ

CH3 - MOVEMENT IN AND OUT OF CELLS

Active transport is the movement of

2016 Summer

2

MCQ

CH4 - BIOLOGICAL MOLECULES

When bases pair up in the formation of DNA, what is one of the pairings? [Options provided]

2016 Summer

1

MCQ

CH4 - BIOLOGICAL MOLECULES

Small molecules are used as the basic units in the synthesis of large food molecules. Which statement is correct?

2016 Summer

2

MCQ

CH5 - ENZYMES

Which graph shows the effect of temperature on the activity of an enzyme?

2016 Summer

2