A Level Biology -Communication, Homeostasis & Energy – 1 – Exam Style Questions with Answers

Fig. 11.1 shows the heat flow through the skin of an athlete during vigorous exercise. Exercise starts at 400 seconds.
Blood flow can be directed to those parts of the body that make the greatest demands.
Which row gives the best explanation of the stages in Fig. 11.1?

Which of the options, A to D, correctly describes how an endotherm would respond to an increase in
temperature?

Which of the following statements demonstrate that plant cells carry out cell signalling?
1 Plants have cell surface receptors that cause the cells to respond to specific molecules.
2 Binding to receptors at the plasma membrane can change chemical pathways within the cell.
3 Plant cells respond to soluble molecules which can be carried in both the xylem and the phloem.

Which of the following, A to D, is not an example of cell signalling?

The hormone ecdysone is synthesised in the prothoracic glands found in the upper thorax of some
invertebrates and is released into haemolymph. It is then transported to cells near the surface of the body and
causes the loss of the exoskeleton so that a new exoskeleton can form.
Which of the following statements explains how ecdysone is able to act on cells near the surface of the body?
1 Ecdysone is synthesised by specialised neurosecretory cells.
2 Ecdysone is soluble in haemolymph because it is a polar molecule.
3 Ecdysone is complementary to cell surface receptors on cells throughout the body of some inhrertebrates.

Which process, A to D, is a correct reason for cell signalling in multicellular organisms?

The following terms relate to the metabolism of carbohydrates in the human body:
1 gluconeogenesis
2 glycogenesis
3 glycolysis
Which of these processes will be stimulated when glucagon is released into the bloodstream?

The graph below shows the change in glucose concentration in a rat's bloodstream over a short period of time. Which of the statements, A to D, is correct?