Theory

CH14 - HOMEOSTASIS

(a) In mammals, blood glucose concentration is maintained around a set point so that the mammal can function efficiently. This is an example of homeos...

2024 Summer

4

Theory

CH14 - HOMEOSTASIS

(a) Blood glucose concentration is maintained around a set point by homeostasis. Explain the principles of homeostasis. .................................

2024 Winter

3

Theory

CH14 - HOMEOSTASIS

(a) Fig. 1.1 is a diagram of part of a Bowman's capsule and a glomerular capillary.(i) Identify structures A and B.......................................

2024 Winter

4

Theory

CH14 - HOMEOSTASIS

(a) Fig. 1.1 is a diagram of a nephron.Label Fig. 1.1 using:• one labelling line and the letter A to identify a region that contains urine• one la...

2024 Spring

3

Theory

CH14 - HOMEOSTASIS

Osmoregulation is the control of the water potential of body fluids such as blood.(a) Osmoreceptors and antidiuretic hormone (ADH) have an important r...

2024 Summer

3

Theory

CH14 - HOMEOSTASIS

The mammalian kidney is responsible for:• the excretion of urea• osmoregulation (the homeostatic control of the water potential of the blood).(a) ...

2024 Winter

3

Theory

CH14 - HOMEOSTASIS

(a) Name structures A, B and C.A .....................................................................................................B .................

2024 Summer

1

Theory

CH14 - HOMEOSTASIS

The kidney is an important organ of homeostasis. One role of the kidney is osmoregulation. (a) Fig. 5.1 is a photomicrograph of part of a kidney nephr...

2023 Summer

2

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

2

Theory

CH14 - HOMEOSTASIS

Amino acids are the monomers that are used to produce proteins in organisms. Amino acids also have other, non-protein, roles in the body.(a) Fig. 7.1 ...

2023 Summer

4

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

3

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

3

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

3

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

3

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

3

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

2

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

2

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

3

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

3

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

3