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

A student used a light microscope to observe a blood smear on a microscope slide.An eyepiece graticule was used to measure the diameter of a white blo...

2024 Spring

4

MCQ

CH1 - CELL STRUCTURE

Which statement explains why it is necessary to use an electron microscope to see the cristae of a mitochondrion?

2024 Spring

4

MCQ

CH1 - CELL STRUCTURE

Some stains can be used to identify cell structures in living cells.A dilute solution of one stain causes the whole cell to appear blue.The blue colou...

2024 Spring

4

MCQ

CH1 - CELL STRUCTURE

When mucus is secreted from a goblet cell, these events take place.1 addition of carbohydrate to protein2 fusion of a vesicle with the cell surface me...

2024 Spring

3

MCQ

CH1 - CELL STRUCTURE

The diagram shows four biological features. Which biological features are present in typical prokaryotes?

2024 Spring

3

MCQ

CH1 - CELL STRUCTURE

Which row shows features that occur in dicotyledonous plant cells and also in typical bacterial cells?key✓ = found in dicotyledonous plant cells and...

2024 Spring

3

MCQ

CH2 - BIOLOGICAL MOLECULES

Which flow chart outlining the test for non-reducing sugars is correct?

2024 Spring

3

MCQ

CH2 - BIOLOGICAL MOLECULES

Which diagrams show the release of a water molecule during the formation of a glycosidic bond?[Image_1: Shows three chemical diagrams each illustratin...

2024 Spring

3

MCQ

CH2 - BIOLOGICAL MOLECULES

Which molecules have a structural formula that contains C=O bonds? 1. amino acids 2. fatty acids 3. glycerol 4. protein

2024 Spring

5

MCQ

CH2 - BIOLOGICAL MOLECULES

Which statement about triglycerides is correct?

2024 Spring

3