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

CH2 - BIOLOGICAL MOLECULES

(a) Fig. 1.1 shows the breakdown of a molecule of sucrose.(i) Name the bond indicated by T...............................................................

2010 Summer

3

Theory

CH1 - CELL STRUCTURE

(a) Calculate the actual diameter of the alveolus along the line X–Y.Show your working and give your answer to the nearest micrometre.Answer = ........

2010 Summer

3

Theory

CH8 - TRANSPORT IN MAMMALS

(a) Fig. 3.1 shows a cross-section of the heart at the level of the valves.[Image_1: Fig. 3.1](i) Complete the following flow chart to show the pathwa...

2010 Summer

2

Theory

CH10 - INFECTIOUS DISEASE

Malaria and tuberculosis (TB) are two of the most important infectious diseases.(a) Define the term \textit{infectious disease}..........................

2010 Summer

3

Theory

CH6 - NUCLEIC ACIDS AND PROTEIN SYNTHESIS

(a) Name the stage during the mitotic cell cycle when replication of DNA occurs..........................................................................

2010 Summer

2

Theory

CH1 - CELL STRUCTURE

(a) Name the processes that occur at H, J and K.H .......................................................................................................

2010 Summer

3

Theory

CH1 - CELL STRUCTURE

(a) Explain how Fig. 1.1 can be identified as a plant cell...............................................................................................

2010 Summer

3

Theory

CH8 - TRANSPORT IN MAMMALS

Fig. 2.1 is a diagram of a vertical section through a healthy mammalian heart. (a) (i) Label the two chambers of the heart by writing in the boxes pro...

2010 Summer

2

Theory

CH10 - INFECTIOUS DISEASE

(a) Using the ‘without HIV/AIDS’ and ‘with HIV/AIDS’ data shown in Table 3.1, calculate the percentage decrease in life expectancy for Botswan...

2010 Summer

3

Theory

CH2 - BIOLOGICAL MOLECULES

Fig. 4.1 shows the primary structure of a lysozyme molecule, an enzyme found in tears, saliva and in lysosomes. (a) (i) Explain what is meant by th...

2010 Summer

3