MCQ

CH8 - TRANSPORT IN MAMMALS

The graph shows the percentage saturation of haemoglobin with oxygen at different partial pressures of oxygen. Which range of partial pressures of ox...

2009 Winter

MCQ

CH8 - TRANSPORT IN MAMMALS

Below are correct statements comparing blood, tissue fluid and lymph in a capillary bed. • W lacks large plasma proteins and red blood cells and has...

2009 Winter

MCQ

CH8 - TRANSPORT IN MAMMALS

The graph shows the percentage saturation of haemoglobin with oxygen at different partial pressures of oxygen.Which range of partial pressures of oxyg...

2009 Winter

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

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

Theory

CH8 - TRANSPORT IN MAMMALS

Fig. 2.1 shows a diagram of a section through a human heart.(a) State the name and function of the circled structure labelled X.name ....................

2010 Summer

Theory

CH8 - TRANSPORT IN MAMMALS

(a) The glycoproteins CD28 and CD40 are found on the surface of T-lymphocytes (T-cells). They are binding sites for cell-signalling molecules and are ...

2010 Summer

MCQ

CH8 - TRANSPORT IN MAMMALS

The mammalian circulatory system is described as a closed double circulation.The diagram shows the circulatory system in a different organism. The arr...

2010 Winter

MCQ

CH8 - TRANSPORT IN MAMMALS

The diagram shows the valves inside the heart. Which valves are open or closed when the atria are relaxed and the ventricles contracted?

2010 Winter

MCQ

CH8 - TRANSPORT IN MAMMALS

When red cells leave the lungs, haemoglobin is 98% saturated.How many molecules of oxygen will be carried by the majority of haemoglobin molecules?

2010 Winter

Theory

CH7 - TRANSPORT IN PLANTS

(a) The structure of a phloem sieve tube element is adapted to its function.Each of explanations A to F describes how a particular structural feature ...

2020 Spring

Theory

CH3 - ENZYMES

Phosphatidate phosphatase (PAP) enzymes have an important role in lipid metabolism.The reaction catalysed by PAP is shown in Fig. 2.1.Experiments were...

2020 Spring

Theory

CH8 - TRANSPORT IN MAMMALS

During one cardiac cycle:blood enters the heart from the lungs and from the rest of the bodyblood leaves the heart to be transported to the lungs and ...

2020 Spring

Theory

CH9 - GAS EXCHANGE AND SMOKING

(a) When a section of lung tissue is viewed using a light microscope, it is possible to identify the trachea, the bronchus, the bronchioles and the al...

2020 Spring

Theory

CH11 - IMMUNITY

Myasthenia gravis and HIV/AIDS both involve disorders of the immune system.(a) Outline why myasthenia gravis is described as a disorder of the immune ...

2020 Spring

Theory

CH1 - CELL STRUCTURE

Fig. 6.1 is a transmission electron micrograph of a plant parenchyma cell.(a) The external environment of the parenchyma cell has a higher water poten...

2020 Spring

Theory

CH14 - HOMEOSTASIS

(a) Fig. 1.1 represents part of the wall of a proximal convoluted tubule (pct) in a kidney nephron.[Image_1: Fig. 1.1](i) Name the features of the wal...

2020 Spring

Theory

CH11 - IMMUNITY

Severe combined immunodeficiency (SCID) is a group of life-threatening diseases. SCID is caused by mutations that prevent the normal function of the i...

2020 Spring

Theory

CH16 - INHERITED CHANGE

Flowers of the common morning-glory plant, Ipomoea purpurea, can have several different phenotypes. An example of these flowers is shown in Fig. 3.1.[...

2020 Spring

Theory

CH16 - INHERITED CHANGE

The rainbow trout, Oncorhynchus mykiss, is a fish that is bred in commercial fish farms. Rainbow trout that have a blue-silver colour are sold at a hi...

2020 Spring