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

MCQ

CH1 - CELL STRUCTURE

The actual length of a cell structure is 8 µm. Which steps are used to calculate the magnification of an electron micrograph of this cell structure?...

2019 Summer

MCQ

CH1 - CELL STRUCTURE

What is the typical resolution of a microscope using daylight as a light source with a ×10 eyepiece lens and a ×40 objective lens?

2019 Summer

MCQ

CH1 - CELL STRUCTURE

Two different types of cell, P and Q, were broken up using ultrasound and their contents analysed. Both types of cell contained small circular DNA. Th...

2019 Summer

MCQ

CH1 - CELL STRUCTURE

Which features shown in the diagram can be present in viruses?

2019 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

After boiling a sample of milk with Benedict’s solution, a yellow colour is observed. Which conclusion about the sample of milk is correct?

2019 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

Which of the statements about polysaccharides can be used to describe amylose and cellulose?1. contains 1,4 glycosidic bonds2. contains 1,6 glycosidic...

2019 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

Which diagram shows the formation of a peptide bond?

2019 Summer

MCQ

CH3 - ENZYMES

In enzyme-catalysed reactions, the position of the amino acids found at the active site is important. During the synthesis of enzymes, amino acids are...

2019 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

Which features affect the tensile strength of collagen?1 the helical structure of collagen chains2 the small R group of the amino acids in collagen3 t...

2019 Summer

MCQ

CH3 - ENZYMES

A fixed volume of the enzyme catalase was added to a fixed volume of hydrogen peroxide solution. The diagram shows how the concentration of product ch...

2019 Summer