Imagine that you are working in a pharmaceutical lab testing the effects of novel compounds on immune cells called macrophages. You discover one that causes an increase in the size and extension of the pseudopods that initiate amoeboid cell movement. This compound most likely:     Inhibits tubulin's catalytic activity     Increases tubulin's catalytic activity     Inhibits actin's catalytic activity     Increases actin's catalytic activity

Bats mostly hunt insects at night. They are able to determine the distance and speed of any prey they are chasing, which has helped them to become excellent nocturnal predators. One potential prey, the tiger moth, has developed two separate methods of evading predation.  First, tiger moths emit a toxin that is distasteful to bats, birds, and most other vertebrate predators. Second, they use an organ called a "tymbal" to create a series of high-pitched clicks that only bats can hear, and which identify the tiger moths as something the bats don't like to eat. Bats who prey on tiger moths discover they don't taste very good, learn to identify tiger moths by their clicks, and avoid eating them. Use this information to answer the questions below.        Question 1: The scenario above describes a distinct evolutionary interaction. What is it?Can you explain?   Question 2: Why is it necessary for the moth to produce both a tymbal click and a toxin? Why not just a toxin? Do you think there are…

Which of the following statements is WRONG with regard to the following molecule? HO O OH NH₂ N It is made from ATP It activates PKA It is highly unstable and rapidly breaks down on its own. It is involved in adrenaline signaling.

GLUT4 is a protein channel that facilitates the transport of glucose into the cell. Under nor- mal conditions, some of the GLUT4 proteins that are synthesized by the cell do not become active and are instead stored within the membranes of vesicles. The insulin receptor tyrosine kinase (TRK) is a receptor protein that facilitates the decrease of glucose concentration in the bloodstream by increasing the uptake of glucose by cells. When the insulin hormone binds the insulin TRK receptor, a signal transduction pathway causes the activation and addition of GLUT4 to the cell membrane. A model of this signal transduction pathway is illustrated in the figure below. insulin insulin receptor cytoplasm A model of the insulin TRK receptor signal-transduction pathway. Which of the following best predicts the effect of a loss of function of the insulin TRK2 A B C D The stimulation of the signal transduction pathway will increase. The storage of GLUT4 inside the cell will increase. The concentration…