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) 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