Theory

CH18 - BIODIVERSITY, CLASSIFICATION AND CONSERVATION

Populations of the moth *Biston betularia* live in Europe and in North America. The most common phenotype on both continents is a pale wing colour wit...

2024 Winter

3

Theory

CH18 - BIODIVERSITY, CLASSIFICATION AND CONSERVATION

Lichens are found growing on trees, walls, rocks and soil.Fig. 9.1 shows a lichen of the genus Usnea. Usnea can tolerate only low concentrations of su...

2024 Winter

3

Theory

CH18 - BIODIVERSITY, CLASSIFICATION AND CONSERVATION

(a) Approximately $2 \times 10^9$ people in the world are currently infected with the bacterial disease tuberculosis (TB) caused by \textit{Mycobacter...

2024 Spring

5

Theory

CH18 - BIODIVERSITY, CLASSIFICATION AND CONSERVATION

(a) The Asian common toad, Duttaphrynus melanostictus, arrived accidentally in eastern Madagascar in 2010 on a ship.Fig. 9.1 shows an Asian common toa...

2024 Summer

2

Theory

CH18 - BIODIVERSITY, CLASSIFICATION AND CONSERVATION

(a) The International Union for Conservation of Nature (IUCN) Red List of Threatened SpeciesTM states that the red ruffed lemur is critically endanger...

2024 Winter

3

Theory

CH18 - BIODIVERSITY, CLASSIFICATION AND CONSERVATION

Bears are several species of mammal in the family Ursidae. Climate change and loss of habitats due to human activity have reduced the size of some bea...

2024 Summer

4

Theory

CH18 - BIODIVERSITY, CLASSIFICATION AND CONSERVATION

Populations of the moth _Biston betularia_ live in Europe and in North America. The most common phenotype on both continents is a pale wing colour wit...

2024 Winter

1

Theory

CH18 - BIODIVERSITY, CLASSIFICATION AND CONSERVATION

(a) Fig. 9.1 shows how the mean global atmospheric carbon dioxide concentration has changed over the 800000 (800 \times 10^{3}) years leading up to th...

2024 Summer

5

Theory

CH18 - BIODIVERSITY, CLASSIFICATION AND CONSERVATION

Lichens are found growing on trees, walls, rocks and soil. Fig. 9.1 shows a lichen of the genus $Usnea$. $Usnea$ can tolerate only low concentrations...

2024 Winter

2

Theory

CH18 - BIODIVERSITY, CLASSIFICATION AND CONSERVATION

(a) The passage outlines one method of estimating the size of an animal population. Complete the passage by using the most appropriate scientific term...

2023 Winter

4

Theory

CH1 - CELL STRUCTURE

(a) (i) Name the cells labelled A and the structure labelled B.A ........................................................................................

2013 Summer

2

Theory

CH10 - INFECTIOUS DISEASE

(a) Explain how the virus that causes measles is transmitted.............................................................................................

2013 Summer

2

Theory

CH7 - TRANSPORT IN PLANTS

(a) Transpiration is often described as an 'inevitable consequence of gas exchange in plants'.Explain what is meant by this statement....................

2013 Summer

1

Theory

CH6 - NUCLEIC ACIDS AND PROTEIN SYNTHESIS

Fig. 4.1 shows the two base pairs in a DNA molecule.(a) Name the bases labelled J and K and the bond labelled L.J .......................................

2013 Summer

1

Theory

CH4 - CELL MEMBRANES AND TRANSPORT

Fig. 5.1 shows a section of a cell surface membrane.(a) State the functions of structures P, Q and R.P ..................................................

2013 Summer

2

Theory

CH5 - THE MITOTIC CELL CYCLE

(a) Explain how uncontrolled cell division can result in cancer. ........................................................................................

2013 Summer

2

Theory

CH5 - THE MITOTIC CELL CYCLE

(a) The cells in Fig. 1.1 are from the same organism and look the same. The cells in Fig. 1.1(a) have been produced by mitosis and the cells in Fig. 1...

2013 Summer

2

Theory

CH7 - TRANSPORT IN PLANTS

Fig. 2.1 shows xylem tissue in a longitudinal section through the stem of a dicotyledonous plant. [Image_1: Fig. 2.1] (a) Describe and explain how the...

2013 Summer

2

Theory

CH10 - INFECTIOUS DISEASE

(a) Explain why tuberculosis (TB) is known as an infectious disease......................................................................................

2013 Summer

3

Theory

CH2 - BIOLOGICAL MOLECULES

Polysaccharides are synthesised by condensation reactions between monosaccharide or disaccharide subunits (monomers).(a) Name the type of bond formed ...

2013 Summer

3