Theory

CH3 - ENZYMES

(a) With reference to Fig. 4.1,(i) nameprocess A ..............................................................molecule B ...............................

2009 Summer

MCQ

CH3 - ENZYMES

In an experiment, 5 cm^3 of 1\% salivary amylase are added to 100 cm^3 of different concentrations of starch. Which graph shows the results of plotti...

2009 Winter

MCQ

CH3 - ENZYMES

The diagram shows a red blood cell and the concentrations of ions, in mmol dm-3, in the plasma and in the cell.Which ions are actively transported int...

2009 Winter

MCQ

CH3 - ENZYMES

Diagrams 1 and 2 show how the transverse section through a leaf changes when moved from one solution W to a different solution Y. How has the water...

2009 Winter

MCQ

CH3 - ENZYMES

Cystic fibrosis is a disease where $\text{Cl}^-$ ions are unable to be transported into cells.Which structure in the cell surface membrane is faulty?

2009 Winter

Theory

CH3 - ENZYMES

Amylase is an enzyme that catalyses the hydrolysis of starch. A student investigated the effect of pH on the activity of the enzyme.Eight test-tubes w...

2009 Winter

Theory

CH3 - ENZYMES

Sucrase is the enzyme that catalyses the hydrolysis of sucrose. A student investigated the effect of substrate concentration on the activity of this e...

2009 Winter

Theory

CH3 - ENZYMES

Proteases that work in alkaline conditions are made in large quantities for use in the detergent industry. The microorganism that is generally used fo...

2009 Winter

Theory

CH3 - ENZYMES

(a) Fig. 1.1 shows the breakdown of a molecule of sucrose.(i) Name the bond indicated by T...............................................................

2010 Summer

Theory

CH3 - ENZYMES

(a) Some bacteria, such as Rhizobium, carry out nitrogen fixation, which is an important process in the nitrogen cycle. Explain what is meant by the ...

2010 Summer

MCQ

CH1 - CELL STRUCTURE

What are the appropriate units for measuring diameters of alveoli, diameters of white blood cells and the width of cell walls?[Table_1]

2015 Summer

MCQ

CH1 - CELL STRUCTURE

The diagram shows a high-power drawing of a bacterium. Which three components are found in both this bacterium and an animal cell?

2015 Summer

MCQ

CH1 - CELL STRUCTURE

The diagram shows a stage micrometer scale on which the small divisions are 0.1 mm. It is viewed through an eyepiece containing a graticule. The st...

2015 Summer

MCQ

CH1 - CELL STRUCTURE

Which structures are found in typical eukaryotic cells?1. 70S ribosomes2. 80S ribosomes3. linear DNA (chromosomes)4. circular DNA

2015 Summer

MCQ

CH1 - CELL STRUCTURE

What is the function of the nucleolus?

2015 Summer

MCQ

CH1 - CELL STRUCTURE

The electronmicrograph shows a cell. What is the actual diameter of the nucleus?

2015 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

A student carried out four tests for biological molecules on a solution. The observations are shown in the table.[Table_1]Which molecules may be prese...

2015 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

The diagrams show different types of bond found in biological molecules.Which combination of bonds could not be found in a protein with a tertiary str...

2015 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

Which row shows the correct match between the descriptions of biological molecules and where they are found?1 a linear polymer of 1,4 linked β-glucos...

2015 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

Which is the correct description for the structure of amylose and cellulose? [Table_1]

2015 Summer