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

Theory

CH4 - CELL MEMBRANES AND TRANSPORT

(a) Table 1.1 shows three of the processes by which substances in solution can move across cell membranes. It also lists five statements that may appl...

2022 Spring

Theory

CH5 - THE MITOTIC CELL CYCLE

(a) Fig. 2.1 shows a cell at one of the main stages of mitosis in the mitotic cell cycle.(i) Name the stage of mitosis shown in Fig. 2.1.................

2022 Spring

Theory

CH3 - ENZYMES

(a) Enzymes are polymers of amino acids. Complete Fig. 3.1 to show the general structure of an amino acid.[Image_1: Fig. 3.1][1](b) When bananas are p...

2022 Spring

Theory

CH10 - INFECTIOUS DISEASE

Tuberculosis (TB) is a major cause of ill health worldwide.(a) State the name of a bacterium that causes TB in humans....................................

2022 Spring

Theory

CH8 - TRANSPORT IN MAMMALS

Control of heartbeat is myogenic. This means the electrical activity controlling the rhythm of a regular heartbeat begins in the heart muscle itself.A...

2022 Spring

Theory

CH6 - NUCLEIC ACIDS AND PROTEIN SYNTHESIS

(a) (i) Identify structure E and structure F in Fig. 6.1. E .............................................................................................

2022 Spring

Theory

CH17 - SELECTION AND EVOLUTION

The European hedgehog, Erinaceus europaeus, is a small omnivorous mammal. Its body is covered in spines, which are usually brown. A rare variant, whic...

2022 Spring

Theory

CH15 - CONTROL AND CO-ORDINATION

Giant axonal neuropathy (GAN) is a rare autosomal recessive disease, which affects neurones.(a) Mitochondria can move freely within the axons of neuro...

2022 Spring

Theory

CH16 - INHERITED CHANGE

The red blood cells of people with sickle cell anaemia have reduced oxygen-carrying capacity.(a) Explain the relationship between the gene mutation th...

2022 Spring

Theory

CH16 - INHERITED CHANGE

(a) Meiosis is an important process that contributes to genetic variation in a population.Fig. 4.1 shows a pair of homologous chromosomes during proph...

2022 Spring