Theory

CH14 - HOMEOSTASIS

(a) Describe the role of insulin in the regulation of blood glucose concentration........................................................................

2009 Summer

Theory

CH14 - HOMEOSTASIS

(a) Fig. 8.1 shows a scanning electron micrograph of a section through a leaf of the Christmas rose, *Helleborus niger*.[Image_1: Fig. 8.1]Name M and ...

2009 Summer

Theory

CH14 - HOMEOSTASIS

(a) Describe the part played by the proximal convoluted tubules in the functioning of the kidneys. [8] (b) Explain how the collecting ducts in the ki...

2009 Summer

Theory

CH14 - HOMEOSTASIS

(a) Hormones are secreted by endocrine glands.Explain what is meant by the term _endocrine gland_........................................................

2009 Winter

Theory

CH14 - HOMEOSTASIS

(a) The pancreas acts both as an exocrine and an endocrine gland.(i) Describe the parts of the pancreas involved in its endocrine function...............

2009 Winter

Theory

CH14 - HOMEOSTASIS

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

2009 Winter

Theory

CH14 - HOMEOSTASIS

(a) Describe the structure of a kidney nephron and its associated blood vessels. [7](b) Explain how glomerular filtrate is formed. [8]

2010 Summer

Theory

CH14 - HOMEOSTASIS

Follicle stimulating hormone (FSH) and luteinising hormone (LH) both consist of two polypeptide chains, the α and β chains.• The α chains of FSH ...

2010 Summer

Theory

CH14 - HOMEOSTASIS

Follicle stimulating hormone (FSH) and luteinising hormone (LH) both consist of two polypeptide chains, the \( \alpha \) and \( \beta \) chains.The \(...

2010 Summer

Theory

CH14 - HOMEOSTASIS

The secretion of insulin by the islets of Langerhans in the pancreas stimulates the liver to reduce the blood glucose concentration.(a) Describe how t...

2010 Winter

Theory

CH1 - CELL STRUCTURE

(a) Table 1.1 lists cell structures that can be found in eukaryotic cells or prokaryotic cells. Some of these cell structures can be found in both typ...

2023 Spring

Theory

CH2 - BIOLOGICAL MOLECULES

(a) Cysteine is an amino acid containing sulfur. Fig. 2.1 shows the structure of the molecule formed by joining two cysteine molecules together.Draw a...

2023 Spring

Theory

CH7 - TRANSPORT IN PLANTS

(a) Fig. 3.1 is a diagram of an area of phloem tissue from a transverse section through the stem of a squash plant, Cucurbita pepo.(i) Cell X and cell...

2023 Spring

Theory

CH10 - INFECTIOUS DISEASE

Tuberculosis (TB), influenza and polio are examples of infectious diseases.(a) (i) Explain what is meant by an infectious disease........................

2023 Spring

Theory

CH8 - TRANSPORT IN MAMMALS

Pneumonia is a severe lung disease that can interfere with gas exchange. A person with pneumonia can be connected to an ECMO machine. This machine per...

2023 Spring

Theory

CH2 - BIOLOGICAL MOLECULES

(a) Collagen is the most common structural protein in vertebrates. Collagen provides the skin with flexibility and strength.Explain how the structure ...

2023 Spring

Theory

CH14 - HOMEOSTASIS

(a) Fig. 1.1 is a drawing of a longitudinal section (LS) of a human kidney.Use the letters A, B, C and D in Fig. 1.1 to complete Table 1.1.Each letter...

2023 Spring

Theory

CH19 - GENETIC TECHNOLOGY

(a) The start of transcription of the gene IFNA2 by E. coli with the recombinant plasmid shown in Fig. 2.1 needs to be controlled to obtain an optimum...

2023 Spring

Theory

CH19 - GENETIC TECHNOLOGY

Salmon can be genetically modified (GM) to produce increased quantities of growth hormone, which is a protein. GM salmon modified in this way have a f...

2023 Spring

Theory

CH16 - INHERITED CHANGE

Array comparative genome hybridisation (aCGH) is a technique involving the use of a microarray to analyse a genome or sections of a genome.(a) Outline...

2023 Spring