Theory

CH17 - SELECTION AND EVOLUTION

Several different processes can affect allele frequencies in populations.(a) Outline the processes that may affect allele frequencies in wildlife popu...

2024 Winter

3

Theory

CH17 - SELECTION AND EVOLUTION

Variation exists in populations of a species and this may provide the opportunity for evolution to occur.(a) Phenotypic variation exists in many forms...

2024 Summer

3

Theory

CH17 - SELECTION AND EVOLUTION

Genes have a role in determining the overall phenotype of an organism.(a) Using haemophilia as an example, explain the relationship between a gene, a ...

2024 Summer

2

Theory

CH17 - SELECTION AND EVOLUTION

(a) Variation in a particular characteristic can be described as either discontinuous or continuous. Table 5.1 contains a list of statements that app...

2024 Winter

3

Theory

CH17 - SELECTION AND EVOLUTION

Complete the following paragraphs using the most appropriate word or words.The theory of evolution describes a process that can lead to the formation ...

2024 Spring

3

Theory

CH17 - SELECTION AND EVOLUTION

(a) Young spadefoot toads are called tadpoles and live in water in ponds.S. multiplicata tadpoles show three different phenotypes due to genetic varia...

2024 Winter

3

Theory

CH17 - SELECTION AND EVOLUTION

It has been hypothesised that the mutation rate of an animal species may affect how fast animals of that species age and how long they live (lifespan)...

2024 Summer

3

Theory

CH17 - SELECTION AND EVOLUTION

The harlequin ladybird, Harmonia axyridis, is an insect that shows discontinuous variation in colour pattern and continuous variation in body size.(a)...

2024 Summer

3

Theory

CH17 - SELECTION AND EVOLUTION

(a) Young spadefoot toads are called tadpoles and live in water in ponds.S. multiplicata tadpoles show three different phenotypes due to genetic varia...

2024 Winter

2

Theory

CH17 - SELECTION AND EVOLUTION

Oryza is a genus of grass plants that includes the rice, Oryza sativa, a food crop.(a) Farmers flood fields of rice because this encourages faster gro...

2023 Summer

3

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

5

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

3

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

4

MCQ

CH1 - CELL STRUCTURE

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

2019 Summer

3

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

3

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

3

MCQ

CH2 - BIOLOGICAL MOLECULES

Which diagram shows the formation of a peptide bond?

2019 Summer

3

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

3

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

3

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

3