Theory

CH13 - PHOTOSYNTHESIS

(a) A touch stimulus to an $M. pudica$ leaf causes an action potential to be generated. The action potential results in changes in cells, which cause ...

2024 Winter

3

Theory

CH13 - PHOTOSYNTHESIS

Stomata in leaves respond to changes in environmental conditions by opening and closing. This regulates carbon dioxide uptake and water loss.(a) Descr...

2024 Summer

3

Theory

CH13 - PHOTOSYNTHESIS

Photosynthesis is the energy transfer process that occurs in chloroplasts.Fig. 5.1 shows some biochemical events that occur in a chloroplast during th...

2024 Summer

4

Theory

CH13 - PHOTOSYNTHESIS

(a) Paper chromatography is a technique that can be used to separate and identify different chloroplast pigments.Describe how the results of paper chr...

2024 Winter

4

Theory

CH13 - PHOTOSYNTHESIS

(a) In plants, stomata open and close in response to changes in environmental conditions. Explain why stomata need to open and close according to envi...

2024 Summer

3

Theory

CH13 - PHOTOSYNTHESIS

(a) Experiments were carried out to determine the effect of light intensity on the rate of photosynthesis of a species of the unicellular prototist, C...

2024 Summer

1

Theory

CH13 - PHOTOSYNTHESIS

(a) A touch stimulus to an $M. \; pudica$ leaf causes an action potential to be generated.The action potential results in changes in cells, which caus...

2024 Winter

1

Theory

CH13 - PHOTOSYNTHESIS

(a) Table 1.1 describes some functions that occur in different parts of a chloroplast.Complete Table 1.1 by identifying the letter on Fig. 1.1 that is...

2023 Summer

3

Theory

CH13 - PHOTOSYNTHESIS

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

Theory

CH13 - PHOTOSYNTHESIS

Chloroplasts carry out photosynthesis. Fig. 1.1 shows some structural features of a chloroplast and some processes that occur within it. (a) (i) I...

2023 Winter

3

Theory

CH1 - CELL STRUCTURE

(a) Table 1.1 lists cell structures that can be found in eukaryotic cells or prokaryotic cells. Some of these cell structures can be found in both typ...

2023 Spring

3

Theory

CH2 - BIOLOGICAL MOLECULES

(a) Cysteine is an amino acid containing sulfur. Fig. 2.1 shows the structure of the molecule formed by joining two cysteine molecules together.Draw a...

2023 Spring

3

Theory

CH7 - TRANSPORT IN PLANTS

(a) Fig. 3.1 is a diagram of an area of phloem tissue from a transverse section through the stem of a squash plant, Cucurbita pepo.(i) Cell X and cell...

2023 Spring

3

Theory

CH10 - INFECTIOUS DISEASE

Tuberculosis (TB), influenza and polio are examples of infectious diseases.(a) (i) Explain what is meant by an infectious disease........................

2023 Spring

3

Theory

CH8 - TRANSPORT IN MAMMALS

Pneumonia is a severe lung disease that can interfere with gas exchange. A person with pneumonia can be connected to an ECMO machine. This machine per...

2023 Spring

3

Theory

CH2 - BIOLOGICAL MOLECULES

(a) Collagen is the most common structural protein in vertebrates. Collagen provides the skin with flexibility and strength.Explain how the structure ...

2023 Spring

2

Theory

CH14 - HOMEOSTASIS

(a) Fig. 1.1 is a drawing of a longitudinal section (LS) of a human kidney.Use the letters A, B, C and D in Fig. 1.1 to complete Table 1.1.Each letter...

2023 Spring

2

Theory

CH19 - GENETIC TECHNOLOGY

(a) The start of transcription of the gene IFNA2 by E. coli with the recombinant plasmid shown in Fig. 2.1 needs to be controlled to obtain an optimum...

2023 Spring

3

Theory

CH19 - GENETIC TECHNOLOGY

Salmon can be genetically modified (GM) to produce increased quantities of growth hormone, which is a protein. GM salmon modified in this way have a f...

2023 Spring

3

Theory

CH16 - INHERITED CHANGE

Array comparative genome hybridisation (aCGH) is a technique involving the use of a microarray to analyse a genome or sections of a genome.(a) Outline...

2023 Spring

3