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

MCQ

CH1 - CELL STRUCTURE

Which organelles are enclosed in a single phospholipid bilayer and contain hydrolytic enzymes?

2017 Summer

3

MCQ

CH1 - CELL STRUCTURE

The DNA of prokaryotes is naked and circular.Which statement describes how the DNA of eukaryotes differs from that of prokaryotes?

2017 Summer

3

MCQ

CH1 - CELL STRUCTURE

The recently discovered Pandoravirus measures 1000 nm in diameter.The Mimivirus has a diameter of 400 nm.What can be detected using a light microscope...

2017 Summer

4

MCQ

CH1 - CELL STRUCTURE

What are found in chloroplasts and mitochondria?1. DNA2. 70S ribosomes3. mRNA

2017 Summer

3

MCQ

CH1 - CELL STRUCTURE

Boiling the bones and teeth from dead animals can be used to produce a type of glue. The glue is formed from the collagen fibres present in bones and ...

2017 Summer

3

MCQ

CH1 - CELL STRUCTURE

What describes the primary structure of a protein?

2017 Summer

3

MCQ

CH2 - BIOLOGICAL MOLECULES

The diagrams show four monosaccharides with the formula $C_6H_{12}O_6$.Which diagram shows $\alpha$-glucose?

2017 Summer

2

MCQ

CH2 - BIOLOGICAL MOLECULES

Complete digestion of polysaccharides requires all the glycosidic bonds between the monomers to be broken.Amylase only breaks $\alpha$-1,4 glycosidic ...

2017 Summer

3

MCQ

CH2 - BIOLOGICAL MOLECULES

The diagram shows the results of tests on four solutions containing biological molecules. Which shows the solution that contains only starch and prote...

2017 Summer

3

MCQ

CH2 - BIOLOGICAL MOLECULES

The enzyme invertase catalyses the breakdown of sucrose to glucose and fructose.Three different enzyme inhibitors of invertase X, Y and Z were investi...

2017 Summer

4