The LacY gene codes for the production of the lactose transport protein. Which of the following is true of a mutant cell containing only mutant, non-functional LacY protein and growing in high lactose, low glucose conditions?

Describe the process of protein synthesis and trafficking of a protein, a lysosomal hydrolase, destined to be inside the lysosome.  You do not need to detail the mechanism of translation but do state the role of the ribosome in getting your hydrolase to the lysosome.  Include how the pulse-chase experiment could help demonstrate the path taken by the protein on its way to the lysosome. What is function and purpose of the organelles the protein will pass through and how it gets from organelle to organelle.  In other words, what happens to the protein along the way?

Which of the following describes a mechanism by which microtubules are known to be stabilized?     Conformational changes undertaken by beta-tubulin as it hydrolyzes GTP.     Binding of microtubule binding proteins, such as Tau.     Shortening of the GTP cap.     Increasing the proportion of alpha-tubulin subunits relative to beta-tubulin subunits.

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…