Author: Anonymous

A 45-year-old male with a history of recurrent pulmonary infections presents with infertility. Genetic testing reveals a mutation affecting a protein that spans the plasma membrane 12 times with hydrophobic domains. Which of the following techniques would most likely have been used to initially identify the membrane-spanning regions of this protein?

A patient comes in after drinking a bottle of nitrous acid solution, where the pH of the solution is 1.15. If the pKa of nitrous acid is 3.15, what is the ratio of base to acid?

A 55-year-old patient with a genetic disorder characterized by pathological suppression of gene expression is being evaluated for potential therapeutic interventions. The patient’s cells show abnormally high levels of histone deacetylase activity at critical gene loci. Which of the following drug classes would be most appropriate to treat this condition?

A 45-year-old patient with glioblastoma multiforme is being treated with domatinostat, a Class I HDAC inhibitor. The treatment leads to selective apoptosis of glioma stem cells while sparing differentiated progeny. Which of the following best explains the mechanism by which HDAC inhibitors such as domatinostat induce cell death in these cancer stem cells?

What is represented by the red box here?

A 25-year-old woman receives a booster vaccination. The vaccine antigen is taken up by dendritic cells in her skin, which then migrate to the nearest lymph node. Over the next several days, she develops a robust antibody response with class switching from IgM to IgG. Where in the lymph node do the T and B cells that enable this response most likely interact?

Which of the following describes the coronal plane?

What are the major constituents of a lipoprotein?

Describe the composition of cardiac muscle and explain the function of the major components. How can you differentiate between cardiac muscle and skeletal muscle under a microscope? 

Provide an example of a positive feedback loop in the body. Explain the mechanism of the loop and why it is important to have this positive feedback loop. What would happen if this was a negative feedback loop instead?