Theory

CH9 - GAS EXCHANGE AND SMOKING

(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

MCQ

CH9 - GAS EXCHANGE AND SMOKING

What would be seen in an electron micrograph of a bronchus wall?1 cartilage cells2 ciliated cells3 exocytotic vesicles

2009 Winter

MCQ

CH9 - GAS EXCHANGE AND SMOKING

An oxygen molecule diffuses directly from the air in an alveolus to haemoglobin in a red blood cell. What is the minimum number of cell surface membr...

2009 Winter

MCQ

CH9 - GAS EXCHANGE AND SMOKING

A disease damages alveoli. Which effect does this have on the gas exchange surface area and volume of the lungs? [Table_1]

2009 Winter

MCQ

CH9 - GAS EXCHANGE AND SMOKING

A disease damages alveoli.Which effect does this have on the gas exchange surface area and volume of the lungs?[Table_1]

2009 Winter

MCQ

CH9 - GAS EXCHANGE AND SMOKING

An oxygen molecule diffuses directly from the air in an alveolus to haemoglobin in a red blood cell. What is the minimum number of cell surface membr...

2009 Winter

MCQ

CH9 - GAS EXCHANGE AND SMOKING

What would be seen in an electron micrograph of a bronchus wall?1. cartilage cells2. ciliated cells3. exocytotic vesicles

2009 Winter

MCQ

CH9 - GAS EXCHANGE AND SMOKING

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

Theory

CH9 - GAS EXCHANGE AND SMOKING

Fig. 3.1 is an electron micrograph of a lymphocyte in the process of cell division during an immune response.(a) With reference to Fig. 3.1,(i) name t...

2009 Winter

Theory

CH9 - GAS EXCHANGE AND SMOKING

(a) Calculate the actual diameter of the alveolus along the line X–Y.Show your working and give your answer to the nearest micrometre.Answer = ........

2010 Summer

Theory

CH1 - CELL STRUCTURE

(a) (i) Name the cells labelled A and the structure labelled B.A ........................................................................................

2013 Summer

Theory

CH10 - INFECTIOUS DISEASE

(a) Explain how the virus that causes measles is transmitted.............................................................................................

2013 Summer

Theory

CH7 - TRANSPORT IN PLANTS

(a) Transpiration is often described as an 'inevitable consequence of gas exchange in plants'.Explain what is meant by this statement....................

2013 Summer

Theory

CH6 - NUCLEIC ACIDS AND PROTEIN SYNTHESIS

Fig. 4.1 shows the two base pairs in a DNA molecule.(a) Name the bases labelled J and K and the bond labelled L.J .......................................

2013 Summer

Theory

CH4 - CELL MEMBRANES AND TRANSPORT

Fig. 5.1 shows a section of a cell surface membrane.(a) State the functions of structures P, Q and R.P ..................................................

2013 Summer

Theory

CH5 - THE MITOTIC CELL CYCLE

(a) Explain how uncontrolled cell division can result in cancer. ........................................................................................

2013 Summer

Theory

CH5 - THE MITOTIC CELL CYCLE

(a) The cells in Fig. 1.1 are from the same organism and look the same. The cells in Fig. 1.1(a) have been produced by mitosis and the cells in Fig. 1...

2013 Summer

Theory

CH7 - TRANSPORT IN PLANTS

Fig. 2.1 shows xylem tissue in a longitudinal section through the stem of a dicotyledonous plant. [Image_1: Fig. 2.1] (a) Describe and explain how the...

2013 Summer

Theory

CH10 - INFECTIOUS DISEASE

(a) Explain why tuberculosis (TB) is known as an infectious disease......................................................................................

2013 Summer

Theory

CH2 - BIOLOGICAL MOLECULES

Polysaccharides are synthesised by condensation reactions between monosaccharide or disaccharide subunits (monomers).(a) Name the type of bond formed ...

2013 Summer