Theory

CH15 - CONTROL AND CO-ORDINATION

(a) The steroid hormones oestrogen and progesterone are secreted by the ovary. State precisely the sites of secretion of each. oestrogen ................

2009 Summer

Theory

CH15 - CONTROL AND CO-ORDINATION

(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

CH15 - CONTROL AND CO-ORDINATION

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

2009 Winter

Theory

CH15 - CONTROL AND CO-ORDINATION

(a) Describe a reflex arc and explain why such reflex arcs are important. [7](b) Describe the structure of a myelin sheath and explain its role in the...

2009 Winter

Theory

CH15 - CONTROL AND CO-ORDINATION

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

2009 Winter

Theory

CH15 - CONTROL AND CO-ORDINATION

(a) Describe how a nerve impulse crosses a cholinergic synapse. [9](b) Explain the roles of synapses in the nervous system. [6]

2009 Winter

Theory

CH15 - CONTROL AND CO-ORDINATION

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

CH15 - CONTROL AND CO-ORDINATION

(a) Describe the structure of a myelinated sensory neurone. [7](b) Explain how an action potential is transmitted along a sensory neurone. [8][Total: ...

2010 Summer

Theory

CH15 - CONTROL AND CO-ORDINATION

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

2010 Summer

Theory

CH15 - CONTROL AND CO-ORDINATION

(a) Describe the structure of a myelinated sensory neurone. [7] (b) Explain how an action potential is transmitted along a sensory neurone. [8] [Total...

2010 Summer

Theory

CH1 - CELL STRUCTURE

Fig. 1.1 shows the outline of a ciliated cell from the human gas exchange system.(a) (i) Inside the ciliated cell in Fig. 1.1, draw the nuclear envelo...

2009 Summer

Theory

CH18 - BIODIVERSITY, CLASSIFICATION AND CONSERVATION

(a) The table below gives some terms that are used in ecology and their definitions. Complete the table.termdefinitionecosystemall the organisms and t...

2009 Summer

Theory

CH4 - CELL MEMBRANES AND TRANSPORT

(a) With reference to Fig. 3.1 and the information above, explain how flatworms survive without a transport system for respiratory gases. ...............

2009 Summer

Theory

CH6 - NUCLEIC ACIDS AND PROTEIN SYNTHESIS

(a) With reference to Fig. 4.1,(i) nameprocess A ..............................................................molecule B ...............................

2009 Summer

Theory

CH7 - TRANSPORT IN PLANTS

Fig. 5.1 shows part of a transverse section of a leaf.(a) Explain, in terms of water potential, how water moves from Q to R..............................

2009 Summer

Theory

CH5 - THE MITOTIC CELL CYCLE

(a) Fig. 6.1 is an electron micrograph of a cancer cell in the process of dividing by mitosis. The stage of mitosis visible in Fig. 6.1 is metaphase.S...

2009 Summer

Theory

CH1 - CELL STRUCTURE

Yeast cells contain enzymes, which catalyse the breakdown of glucose to produce ethanol and carbon dioxide. These products change the environment of t...

2009 Summer

Theory

CH1 - CELL STRUCTURE

J1 is a slide of a stained transverse section of a plant organ.(a) Draw a large, low power, plan diagram of a quarter of the specimen as shown in Fig....

2009 Summer

Theory

CH1 - CELL STRUCTURE

(a) (i) Using the information in Table 1.1, decide which other concentrations to make and complete Table 1.2 including the concentrations from Table 1...

2009 Summer

Theory

CH1 - CELL STRUCTURE

K1 is a slide of a stained transverse section of a plant organ.(a) (i) Draw a large, low power plan diagram of one end of the specimen on K1 as shown ...

2009 Summer