Theory

CH12 - ENERGY AND RESPIRATION

(a) Table 4.1 shows a sequence of 12 nucleotides in the template strand of a short length of a DNA molecule, the corresponding primary transcript and ...

2024 Spring

3

Theory

CH12 - ENERGY AND RESPIRATION

(a) Aerobic respiration occurs in four successive stages: glycolysis (G), link reaction (LR), Krebs cycle (KC) and oxidative phosphorylation (OP).Comp...

2024 Winter

2

Theory

CH12 - ENERGY AND RESPIRATION

(a) Fig. 6.1 is a diagram of part of a mitochondrion.On Fig. 6.1, use arrows to show the route taken by oxygen from the cytoplasm into the mitochondri...

2024 Summer

2

Theory

CH12 - ENERGY AND RESPIRATION

A respirometer is a piece of apparatus that can be used to measure the rate of respiration of living tissue such as germinating peas.A simple respirom...

2024 Spring

2

Theory

CH12 - ENERGY AND RESPIRATION

(a) Aerobic respiration occurs in four successive stages: glycolysis (G), link reaction (LR), Krebs cycle (KC) and oxidative phosphorylation (OP).Comp...

2024 Winter

2

Theory

CH12 - ENERGY AND RESPIRATION

(a) Some organisms carry out respiration in anaerobic conditions when oxygen is not available or when there is a low concentration of oxygen. In yeast...

2023 Winter

3

Theory

CH12 - ENERGY AND RESPIRATION

(a) The respiratory quotient (RQ) values for different respiratory substrates can be calculated.Table 5.1 shows:• the formulae of four respiratory s...

2023 Winter

4

Theory

CH12 - ENERGY AND RESPIRATION

Many factors affect the rate of cellular respiration.(a) Pyruvate carboxylase (PC) deficiency is a rare disease. The rate of respiration in the cells ...

2023 Summer

2

Theory

CH12 - ENERGY AND RESPIRATION

(a) In plants such as rice, Oryza sativa, rubisco has a low rate of activity, which in turn affects the rate of photosynthesis. The cereal crop sorghu...

2023 Summer

2

Theory

CH12 - ENERGY AND RESPIRATION

(a) The Krebs cycle was named after the biochemist Sir Hans Krebs, who worked out the sequence in 1937.Fig. 1.1 is an outline of the Krebs cycle.Ident...

2023 Summer

2

Theory

CH1 - CELL STRUCTURE

Fig. 1.1 shows the outline of a ciliated cell from the human gas exchange system.(a) (i) Inside the ciliated cell in Fig. 1.1, draw the nuclear envelo...

2009 Summer

2

Theory

CH18 - BIODIVERSITY, CLASSIFICATION AND CONSERVATION

(a) The table below gives some terms that are used in ecology and their definitions. Complete the table.termdefinitionecosystemall the organisms and t...

2009 Summer

2

Theory

CH4 - CELL MEMBRANES AND TRANSPORT

(a) With reference to Fig. 3.1 and the information above, explain how flatworms survive without a transport system for respiratory gases. ...............

2009 Summer

2

Theory

CH6 - NUCLEIC ACIDS AND PROTEIN SYNTHESIS

(a) With reference to Fig. 4.1,(i) nameprocess A ..............................................................molecule B ...............................

2009 Summer

3

Theory

CH7 - TRANSPORT IN PLANTS

Fig. 5.1 shows part of a transverse section of a leaf.   (a) Explain, in terms of water potential, how water moves from Q to R. [4] (b)...

2009 Summer

2

Theory

CH5 - THE MITOTIC CELL CYCLE

(a) Fig. 6.1 is an electron micrograph of a cancer cell in the process of dividing by mitosis. The stage of mitosis visible in Fig. 6.1 is metaphase.S...

2009 Summer

3

Theory

CH1 - CELL STRUCTURE

Yeast cells contain enzymes, which catalyse the breakdown of glucose to produce ethanol and carbon dioxide. These products change the environment of t...

2009 Summer

2

Theory

CH1 - CELL STRUCTURE

J1 is a slide of a stained transverse section of a plant organ.(a) Draw a large, low power, plan diagram of a quarter of the specimen as shown in Fig....

2009 Summer

1

Theory

CH1 - CELL STRUCTURE

(a) (i) Using the information in Table 1.1, decide which other concentrations to make and complete Table 1.2 including the concentrations from Table 1...

2009 Summer

2

Theory

CH1 - CELL STRUCTURE

K1 is a slide of a stained transverse section of a plant organ.(a) (i) Draw a large, low power plan diagram of one end of the specimen on K1 as shown ...

2009 Summer

3