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

Which characteristic do all living organisms show?

2017 Summer

1

MCQ

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

The diagram shows some animal cells, as seen under the microscope. What will be present at X?

2017 Summer

2

MCQ

CH1 - CHARACTERISTICS AND CLASSIFICATION OF LIVING ORGANISMS

Each of the diagrams shows an area of cytoplasm.Which is from a prokaryote?

2017 Summer

2

MCQ

CH2 - ORGANIZATION AND MAINTENANCE OF THE ORGANISM

The diagram shows a section through a root.What are the levels of organisation of the labelled structures?

2017 Summer

2

MCQ

CH3 - MOVEMENT IN AND OUT OF CELLS

Which characteristics are correct for both osmosis and diffusion? [Table_1]

2017 Summer

2

MCQ

CH20 - BIOTECHNOLOGY AND GENETIC ENGINEERING

Which diagram shows the structure of DNA?

2017 Summer

2

MCQ

CH5 - ENZYMES

The graph shows how enzyme activity is affected by temperature. How can the change in activity between 40°C and 55°C be explained?

2017 Summer

3

MCQ

CH12 - RESPIRATION

Four test-tubes are set up as shown. Which test-tube contains the most carbon dioxide after one hour?

2017 Summer

3

MCQ

CH12 - RESPIRATION

The graph shows daily carbon dioxide uptake and transpiration by the plant *Agave americana*. The plant is adapted to live in very dry conditions. ...

2017 Summer

3

MCQ

CH6 - PLANT NUTRITION

In plants, which ions are used to make amino acids?

2017 Summer

2