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

1

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

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