A neuron with an intracellular Cl- concentration of 50 mM is placed in a solution that contains 100 mM Cl- at 25 degree celcius. The membrane potential of the neuron is -60 mV. Assuming the neuronal cell membrane has channels that allow facilitated diffusion of Cl-, do you expect Cl- […]

You are studying a set of mouse genes whose expression increases when cells are exposed to the hormone cortisol, and you believe that the same cortisol-responsive transcriptional activator regulates all of these genes. Which of the following statements believe should be TRUE if your hypothesis is correct? A. The cortisol-responsive […]

In addition to protein phosphorylation and dephosphorylation, protein degradation also plays key role in regulating signal transduction pathways and cell proliferation. Please answer the following questions: (1). Please give one example to describe how protein degradation regulates signal transduction pathway; (2) Please give another example to describe how protein degradation […]

Q1. What time one is cold or the external temperature is low, most venous blood returning from the distal part of the arm travels in the deep veins where it picks up heat (by concurrent exchange) from the nearby brachial artery en route. Though, when one is hot, and especially […]