Question

True or False?

Muscle and liver cells have only one form of Glycogen phosphorylase, either a or b, and only an R or a T state

Answer 1

False, both muscle and liver cells contain two forms of the enzyme Glycogen phosphorylase (α and β), and both forms can exist in either the R or T state.

Step-by-step explanation:

False. Muscle and liver cells have both forms Glycogen phosphorylase α (alpha) and β (beta) and both can exist in the 'relaxed' (R) state or 'tense' (T) state. These forms are interconverted in response to various hormonal signals or changing energy needs of the cell. For instance, Glycogen phosphorylase a, which is the active form, is prevalent when energy is required quickly, such as during muscle contraction. On the other hand, Glycogen phosphorylase b is the less active form and is more common when immediate energy production is not necessary.