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

CH4 - CELL MEMBRANES AND TRANSPORT

(a) Table 1.1 shows three of the processes by which substances in solution can move across cell membranes. It also lists five statements that may appl...

2022 Spring

Theory

CH5 - THE MITOTIC CELL CYCLE

(a) Fig. 2.1 shows a cell at one of the main stages of mitosis in the mitotic cell cycle.(i) Name the stage of mitosis shown in Fig. 2.1.................

2022 Spring

Theory

CH3 - ENZYMES

(a) Enzymes are polymers of amino acids. Complete Fig. 3.1 to show the general structure of an amino acid.[Image_1: Fig. 3.1][1](b) When bananas are p...

2022 Spring

Theory

CH10 - INFECTIOUS DISEASE

Tuberculosis (TB) is a major cause of ill health worldwide.(a) State the name of a bacterium that causes TB in humans....................................

2022 Spring

Theory

CH8 - TRANSPORT IN MAMMALS

Control of heartbeat is myogenic. This means the electrical activity controlling the rhythm of a regular heartbeat begins in the heart muscle itself.A...

2022 Spring

Theory

CH6 - NUCLEIC ACIDS AND PROTEIN SYNTHESIS

(a) (i) Identify structure E and structure F in Fig. 6.1. E .............................................................................................

2022 Spring

Theory

CH17 - SELECTION AND EVOLUTION

The European hedgehog, Erinaceus europaeus, is a small omnivorous mammal. Its body is covered in spines, which are usually brown. A rare variant, whic...

2022 Spring

Theory

CH15 - CONTROL AND CO-ORDINATION

Giant axonal neuropathy (GAN) is a rare autosomal recessive disease, which affects neurones.(a) Mitochondria can move freely within the axons of neuro...

2022 Spring

Theory

CH16 - INHERITED CHANGE

The red blood cells of people with sickle cell anaemia have reduced oxygen-carrying capacity.(a) Explain the relationship between the gene mutation th...

2022 Spring

Theory

CH16 - INHERITED CHANGE

(a) Meiosis is an important process that contributes to genetic variation in a population.Fig. 4.1 shows a pair of homologous chromosomes during proph...

2022 Spring