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

What are the appropriate units for measuring diameters of alveoli, diameters of white blood cells and the width of cell walls?[Table_1]

2015 Summer

1

MCQ

CH1 - CELL STRUCTURE

The diagram shows a high-power drawing of a bacterium. Which three components are found in both this bacterium and an animal cell?

2015 Summer

1

MCQ

CH1 - CELL STRUCTURE

The diagram shows a stage micrometer scale on which the small divisions are 0.1 mm. It is viewed through an eyepiece containing a graticule. The st...

2015 Summer

1

MCQ

CH1 - CELL STRUCTURE

Which structures are found in typical eukaryotic cells?1. 70S ribosomes2. 80S ribosomes3. linear DNA (chromosomes)4. circular DNA

2015 Summer

1

MCQ

CH1 - CELL STRUCTURE

What is the function of the nucleolus?

2015 Summer

1

MCQ

CH1 - CELL STRUCTURE

The electronmicrograph shows a cell. What is the actual diameter of the nucleus?

2015 Summer

1

MCQ

CH2 - BIOLOGICAL MOLECULES

A student carried out four tests for biological molecules on a solution. The observations are shown in the table.[Table_1]Which molecules may be prese...

2015 Summer

1

MCQ

CH2 - BIOLOGICAL MOLECULES

The diagrams show different types of bond found in biological molecules.Which combination of bonds could not be found in a protein with a tertiary str...

2015 Summer

1

MCQ

CH2 - BIOLOGICAL MOLECULES

Which row shows the correct match between the descriptions of biological molecules and where they are found?1 a linear polymer of 1,4 linked β-glucos...

2015 Summer

2

MCQ

CH2 - BIOLOGICAL MOLECULES

Which is the correct description for the structure of amylose and cellulose? [Table_1]

2015 Summer

1