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

5

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

4

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

2

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

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