Theory

CH15 - CONTROL AND CO-ORDINATION

(a) Fig. 1.1 is a diagram of a motor neurone of a rat and a motor neurone of a snail.(i) Name the structures labelled A, B and C on Fig. 1.1.............

2024 Winter

3

Theory

CH15 - CONTROL AND CO-ORDINATION

(a) Striated muscle is composed of myofibrils. Myofibrils contain several structural proteins including troponin, tropomyosin, actin and myosin.Outlin...

2024 Spring

3

Theory

CH15 - CONTROL AND CO-ORDINATION

(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

CH15 - CONTROL AND CO-ORDINATION

The scientist Gregor Mendel investigated differences in the length of the stem in the pea plant, Pisum sativum. In 1866, he published the results of h...

2024 Spring

2

Theory

CH15 - CONTROL AND CO-ORDINATION

Humans detect the sweet taste of sucrose sugar using chemoreceptor cells in taste buds on the tongue. The red admiral butterfly, Vanessa atalanta, det...

2024 Summer

3

Theory

CH15 - CONTROL AND CO-ORDINATION

(a) Coordination in humans involves two main systems: the nervous system and the endocrine system. Paracrine cell signalling is a third way in which c...

2024 Summer

3

Theory

CH15 - CONTROL AND CO-ORDINATION

(a) Fig. 8.1 is a diagram of a sensory neurone.(i) Name the type of cell represented by cell A. [1]......................................................

2024 Summer

3

Theory

CH15 - CONTROL AND CO-ORDINATION

(a) Fig. 8.1 is a diagram of a motor neurone.[Image of motor neurone labeled X, Y, Z] (i) Name cell X and part Y.........................................

2024 Winter

3

Theory

CH15 - CONTROL AND CO-ORDINATION

(a) An investigation was carried out to study the effect of different intensities of blue light on the percentage germination of barley seeds. Barley ...

2024 Spring

3

Theory

CH15 - CONTROL AND CO-ORDINATION

(a) Fig. 10.1 is a diagram of part of a neurone membrane while the resting potential is maintained. On Fig. 10.1, use label lines and letters to label...

2024 Summer

3

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

3

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

3

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

2

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

3

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

3

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

3

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

1

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

2

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

2

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

1