In general, a signal transmitted via phosphorylation of a series of proteins
A) brings a conformational change to each protein.
B) requires binding of a hormone to a cytosol receptor.
C) cannot occur in yeasts because they lack protein phosphatases.
D) requires phosphorylase activity.
E) allows target cells to change their shape and therefore their activity.

Question

Quizplus · Accepted Answer

Phosphorylation of proteins brings about a conformational change in their structure, resulting in a change in their activity, which is the basis of signal transmission.

Answer: B
 In signal transduction pathways, hormones or other signaling molecules bind to cytosolic receptors, leading to a cascade of phosphorylation events and the activation of downstream effectors.

Answer: C
 Yeasts possess protein phosphatases, and signal transmission through phosphorylation is a common mechanism in these organisms.

Answer: D
 Phosphorylase activity is not involved in signal transmission via phosphorylation of proteins. Kinases and phosphatases are the enzymes that mediate this process.

Answer: E
 While changes in cell shape can result from signal transduction pathways, this is not a necessary or universal outcome of phosphorylation-dependent signaling. The main objective of phosphorylation-dependent signaling is to alter protein activity, leading to changes in cellular behavior.

In General, a Signal Transmitted Via Phosphorylation of a Series