Exam 11: Cell Communication

At puberty, an adolescent female body changes in both structure and function of several organ systems, primarily under the influence of changing concentrations of estrogens and other steroid hormones. How can one hormone, such as estrogen, mediate so many effects?

Adenylyl cyclase has the opposite effect of which of the following?

Which of the following is the best explanation for the fact that most transduction pathways have multiple steps?

Use the following figure to answer the questions below. -Which of the following types of signalling is represented in the figure?

Receptor tyrosine kinases (RTKs)are found at high levels on various cancer cells. A protein, Herceptin, has been found to bind to an RTK known as HER2. This information can now be utilized in breast cancer treatment if which of the following is true?

In the formation of biofilms, such as those forming on unbrushed teeth, cell signalling serves which function?

Binding of a signalling molecule to which type of receptor leads directly to a change in the distribution of ions on opposite sides of the membrane?

In which of the following ways do plant hormones differ from hormones in animals?

Use the following figure to answer the questions below. -In the above diagram, the structure labelled C is a(n)

An inhibitor of which of the following could be used to block the release of calcium from the endoplasmic reticulum?

The activation of receptor tyrosine kinases is characterized by

Which of the following is a likely explanation of why natural selection favoured the evolution of signals for sexual reproduction?

What explains the increased concentration of Ca²⁺ in the ER?

Because most receptors are membrane proteins, which of the following is usually true?

Use the following figure to answer the questions below. -In the above diagram, what is the significance of E?

One inhibitor of cGMP is Viagra. It provides a signal that leads to dilation of blood vessels and increase of blood in the penis, facilitating erection. Since cGMP is inhibited, the signal is prolonged. The original signal that is now inhibited would have

Which of the following statements is true of signal molecules?

Which of the following most likely would be an immediate result of growth factor binding to its receptor?

Which of the following is characterized by a cell releasing a signal molecule into the environment, followed by a number of cells in the immediate vicinity responding?

Which of the following is true of transcription factors?