Theory

CH10 - INFECTIOUS DISEASE

Fig. 1.1 shows the outline of a ciliated cell from the human gas exchange system.(a) (i) Inside the ciliated cell in Fig. 1.1, draw the nuclear envelo...

2009 Summer

Theory

CH10 - INFECTIOUS DISEASE

The fungus *Penicillium chrysogenum* is grown in fermenters on an industrial scale to produce penicillin, using a batch culture system.(a) Explain why...

2009 Summer

MCQ

CH10 - INFECTIOUS DISEASE

A country has fewer than 2.5 deaths per 100 000 people from TB in one year and the next year this rose to 25 deaths per 100 000. What may have contrib...

2009 Winter

MCQ

CH10 - INFECTIOUS DISEASE

Scientists are concerned that avian (bird) flu caused by the H5N1 virus, could infect humans and cause a pandemic. If this occurs, which factors could...

2009 Winter

MCQ

CH10 - INFECTIOUS DISEASE

Scientists are concerned that avian (bird) flu caused by the H5N1 virus, could infect humans and cause a pandemic.If this occurs, which factors could ...

2009 Winter

MCQ

CH10 - INFECTIOUS DISEASE

A country has fewer than 2.5 deaths per 100 000 people from TB in one year and the next year this rose to 25 deaths per 100 000.What may have contribu...

2009 Winter

Theory

CH10 - INFECTIOUS DISEASE

(a) $P.\ jirovecii$ has a haploid number of 13 chromosomes. Complete the life cycle by writing either mitosis or meiosis in the boxes in Fig. 5.1. [2...

2009 Winter

Theory

CH10 - INFECTIOUS DISEASE

(a) Cell walls of bacteria contain peptidoglycans. Peptidoglycans are long chains of the sugars N-acetylmuramic acid (NAM) and N-acetylglucosamine (NA...

2009 Winter

Theory

CH10 - INFECTIOUS DISEASE

Malaria and tuberculosis (TB) are two of the most important infectious diseases.(a) Define the term \textit{infectious disease}..........................

2010 Summer

Theory

CH10 - INFECTIOUS DISEASE

(a) Using the ‘without HIV/AIDS’ and ‘with HIV/AIDS’ data shown in Table 3.1, calculate the percentage decrease in life expectancy for Botswan...

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