Mary Jones, Richard Fosbery, Dennis Taylor and, Jennifer Gregory Solutions for Chapter: Control and Coordination, Exercise 16: EXAM-STYLE QUESTIONS

Cells can control the activity of enzymes, glycogen synthase and glycogen phosphorylase. Describe how the activity of the glycogen phosphorylase is controlled.

Explain the advantages of using the endocrine system rather than the nervous system for coordinating the effectors that control the composition of the blood.

The given drawing was made from a TEM of an LS through a myelinated neurone.

Name the region of the neurone labelled A.

State the name of the cell that makes myelin.

Explain the role of myelin in impulse transmission.

Outline the changes that occur at region A during the passage of an impulse in the direction shown by the arrow.

Outline the events that occur when an impulse crosses a synapse between two neurones.

Barley grains are used to provide maltose in the making of beer. During the malting stage, gibberellin is often sprayed on the grains to increase the production of maltose. The natural concentration of gibberellin in barley grains is stated to be approximately 346$\times$ 10^-6 g dm-3 which is equivalent to 1.0$\mu mol$ dm-3. Outline a strategy that you could follow to investigate the effect of different concentrations of gibberellin on the activity of amylase in germinating barley grains.