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

MCQ

CH4 - CELL MEMBRANES AND TRANSPORT

Cystic fibrosis is a disease where $Cl^-$ ions are unable to be transported into cells. Which structure in the cell surface membrane is faulty?

2009 Winter

MCQ

CH4 - CELL MEMBRANES AND TRANSPORT

Diagrams 1 and 2 show how the transverse section through a leaf changes when moved from one solution W to a different solution Y. How has the water p...

2009 Winter

MCQ

CH4 - CELL MEMBRANES AND TRANSPORT

The diagram shows a red blood cell and the concentrations of ions, in mmol dm-3, in the plasma and in the cell. Which ions are actively transported in...

2009 Winter

MCQ

CH4 - CELL MEMBRANES AND TRANSPORT

In an experiment, 5 cm$^3$ of 1 % salivary amylase are added to 100 cm$^3$ of different concentrations of starch.Which graph shows the results of plot...

2009 Winter

Theory

CH4 - CELL MEMBRANES AND TRANSPORT

During an immune response, plasma cells secrete antibody molecules. Fig.1.1 is a diagram of an antibody molecule. The diagram is not complete. (a) ...

2009 Winter

Theory

CH4 - CELL MEMBRANES AND TRANSPORT

(a) Cell surface membranes are involved with the movement of substances into and out of cells.Calcium pumps in cell surface membranes maintain a conce...

2009 Winter

Theory

CH4 - CELL MEMBRANES AND TRANSPORT

(a) With reference to Fig. 3.1, explain the effect of penicillin V on bacterium A........................................................................

2010 Summer

MCQ

CH4 - CELL MEMBRANES AND TRANSPORT

Which molecules, found in the cell surface membrane, have the properties listed? [Table 1]

2010 Winter

MCQ

CH4 - CELL MEMBRANES AND TRANSPORT

The stalk of a dandelion is a hollow tube. Pieces of the stalk are cut as shown and placed in sucrose solutions of different water potentials.Which di...

2010 Winter

Theory

CH9 - GAS EXCHANGE AND SMOKING

(a) Fig. 1.1 is an image of a transverse section through the trachea of the gas exchange system.Write the names of structures X and Y on Fig. 1.1 in t...

2021 Spring

Theory

CH2 - BIOLOGICAL MOLECULES

Starch molecules are the main storage molecules in many types of cereal grain, such as the grainof the barley plant.(a) When the seed inside a barley ...

2021 Spring

Theory

CH11 - IMMUNITY

T-helper lymphocytes and Leydig cells are two types of mammalian cells. The main role of T-helper lymphocytes and Leydig cells is to synthesise and se...

2021 Spring

Theory

CH8 - TRANSPORT IN MAMMALS

(a) Using a light microscope at a magnification of ×400, it is possible to identify different types of blood cell in prepared slides of mammalian blo...

2021 Spring

Theory

CH5 - THE MITOTIC CELL CYCLE

Each meristem cell in a leaf bud is able to grow and divide by mitosis to produce two daughter cells that are genetically identical to each other and ...

2021 Spring

Theory

CH10 - INFECTIOUS DISEASE

In March 2019, a tropical cyclone in the south-west Indian Ocean caused widespread flooding in a number of countries.The flooding and the damage cause...

2021 Spring

Theory

CH17 - SELECTION AND EVOLUTION

(a) The European eel, Anguilla anguilla, is a fish. The sizes of eel populations tend to remain relatively stable despite eels producing large numbers...

2021 Spring

Theory

CH18 - BIODIVERSITY, CLASSIFICATION AND CONSERVATION

(a) The grey wolf, *Canis lupus*, is a large predator. During the 20th century, the grey wolf in south-west Europe was hunted almost to extinction.Fig...

2021 Spring

Theory

CH19 - GENETIC TECHNOLOGY

Vitamin A deficiency is a widespread public health problem.One source of vitamin A is carotene in the diet. Carotene can be converted to vitamin A in ...

2021 Spring

Theory

CH13 - PHOTOSYNTHESIS

Red algae are multicellular photosynthetic prototists that contain phycoerythrin. Phycoerythrin is a photosynthetic pigment.(a) Fig. 4.1 shows:• the...

2021 Spring