Theory

CH16 - INHERITED CHANGE

(a) Fig. 4.1 shows a section through a maize fruit.Fig. 4.1(i) Name the parts labelled A to D.A .........................................................

2009 Summer

Theory

CH16 - INHERITED CHANGE

(a) The inheritance of coat colour in horses is complex but all horses have one of two base colours, red (chestnut) or black. The base colour is contr...

2009 Summer

Theory

CH16 - INHERITED CHANGE

(a) Explain how changes in the nucleotide sequence of DNA may affect the amino acid sequence in a protein.[7](b) Explain how natural selection may bri...

2009 Summer

Theory

CH16 - INHERITED CHANGE

(a) Complete Fig. 4.1 by writing letters to represent the sets of chromosomes in bread wheat.(b) Explain why hybridisation between emmer wheat and goa...

2009 Winter

Theory

CH16 - INHERITED CHANGE

(a) The fruit fly, Drosophila melanogaster, feeds on sugars found in damaged fruits. A fly with normal features is called a wild type. It has a stripe...

2009 Winter

Theory

CH16 - INHERITED CHANGE

(a) Fig. 5.1 shows a section through part of a human testis.Fig. 5.1Name structures A and B.A ...........................................................

2009 Winter

Theory

CH16 - INHERITED CHANGE

(a) Explain how two parents, both of whom produce normal amounts of AG, can produce a child with Pompe disease...........................................

2009 Winter

Theory

CH16 - INHERITED CHANGE

(a) Explain what is meant by the term gene mutation......................................................................................................

2010 Summer

Theory

CH16 - INHERITED CHANGE

In humans a rare, sex-linked, recessive allele results in a change in the shape of the iris in the eye. This condition is known as cleft iris (CI).(a)...

2010 Summer

Theory

CH16 - INHERITED CHANGE

In humans a rare, sex-linked, recessive allele results in a change in the shape of the iris in the eye. This condition is known as cleft iris (CI).(a)...

2010 Summer

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