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

7

Theory

CH14 - HOMEOSTASIS

(a) Blood glucose concentration is maintained around a set point by homeostasis. Explain the principles of homeostasis.[4]  (b) Glycogen phospho...

2024 Winter

5

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. (ii) The glomerular filtrate ...

2024 Winter

5

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 ...

2024 Spring

4

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...

2024 Summer

4

Theory

CH14 - HOMEOSTASIS

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

2024 Winter

9

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 kidne...

2023 Summer

8

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 ...

2023 Spring

3

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....

2023 Summer

5

Theory

CH14 - HOMEOSTASIS

(a) (i) When blood glucose concentration decreases, glucagon is released by the pancreas into the blood and is transported to the cells.  Fig. 6...

2023 Winter

2

MCQ

CH1 - CELL STRUCTURE

A cell organelle measures $4 \times 10^{-1}$ mm in diameter.What is the diameter in $\mu$m?

2011 Summer

2

MCQ

CH1 - CELL STRUCTURE

In the following table, which is the correct comparison between light and electron microscopes? [Table_1: light microscope and electron microscope co...

2011 Summer

3

MCQ

CH1 - CELL STRUCTURE

Which structures are present in a typical plant cell? [Table_1]

2011 Summer

3

MCQ

CH1 - CELL STRUCTURE

Plant cells are stained and then viewed through a light microscope.Which structures would be clearly visible at a magnification of ×400?

2011 Summer

3

MCQ

CH1 - CELL STRUCTURE

Which type of cell will contain the highest proportion of single membrane-bound structures?

2011 Summer

3

MCQ

CH2 - BIOLOGICAL MOLECULES

Four different fruit juices, A, B, C and D, were tested with Benedict's solution. A second sample of each juice was hydrolysed and tested with Benedic...

2011 Summer

3

MCQ

Polysaccharides: Starch, Glycogen and Cellulose

Which molecular bonds will be broken by hydrolysis when a molecule of glycogen is converted to glucose?

2011 Summer

2

MCQ

CH2 - BIOLOGICAL MOLECULES

Which set of statements correctly describes haemoglobin?

2011 Summer

3

MCQ

CH2 - BIOLOGICAL MOLECULES

Some foods contain 'hydrogenated vegetable oils'. These are unsaturated fats that have been converted to saturated fats.Which property of the fats wil...

2011 Summer

2

MCQ

CH2 - BIOLOGICAL MOLECULES

Which rows show the chemical groups present in the biological molecules listed?[Table_1]

2011 Summer

2