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

MCQ

CH7 - TRANSPORT IN PLANTS

Which plan diagram of a transverse section of a leaf correctly shows the position of xylem and phloem as well as the fact that the palisade mesophyll ...

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

The diagram shows the changes in pressure potential ($\Psi_p$), solute potential ($\Psi_s$) and water potential ($\Psi$) when a plasmolysed plant cell...

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

What is the sequence of events in the translocation of assimilates?

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

When stained, which features, visible under the light microscope, are part of the cells of the plant tissues listed in the table?[Table_1]

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

What is the sequence of events in the translocation of assimilates?

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

Which description states some of the features of xylem vessels?

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

The diagram shows the changes in pressure potential ($\Psi_p$), solute potential ($\Psi_s$), and water potential ($\Psi$) when a plasmolysed plant cel...

2009 Winter

MCQ

CH7 - TRANSPORT IN PLANTS

When stained, which features, visible under the light microscope, are part of the cells of the plant tissues listed in the table? [Table_1]

2009 Winter

Theory

CH7 - TRANSPORT IN PLANTS

(a) Explain what is meant by the term transpiration......................................................................................................

2009 Winter

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