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

Which statements about resolution and magnification are correct?[Table_1]

2018 Summer

MCQ

CH1 - CELL STRUCTURE

An eyepiece graticule has a scale with 100 divisions. A stage micrometer has a scale with 50 divisions, each of which is 0.040 mm apart. Using a ×40 ...

2018 Summer

MCQ

CH1 - CELL STRUCTURE

A prokaryotic cell which is 1 µm in diameter, is magnified 50000 times in an electron micrograph. What is the diameter of the cell in the electron m...

2018 Summer

MCQ

CH1 - CELL STRUCTURE

A scientist carried out an experiment to separate cell structures in animal cells. The cells were broken open to release the cell structures. This ext...

2018 Summer

MCQ

CH1 - CELL STRUCTURE

Radioactively-labelled nucleotides are introduced into a cell.In which cell structures will the radioactivity first become concentrated?

2018 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

What is the general formula for amylose?

2018 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

The diagram shows relationships between some important molecules and bonds. What is represented by circles numbered 1, 2 and 3?

2018 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

In unsaturated lipid molecules, where are double bonds located?

2018 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

Phospholipids and triglycerides are important biological molecules.Which properties are correct for these molecules?[Table_1]

2018 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

The diagrams show two arrangements of amino acids in a protein. Which row correctly names the bonds at S or T?

2018 Summer