An adult patient has just received a diagnosis of brain cancer and is undergoing treatment. Based on what you know about cell division and cancer, why does this seem unusual?
What will be an ideal response?
In adults, neurons typically do not undergo mitosis. Given that cancer is uncontrolled mitosis, it seems odd that neurons would become cancerous. Thus, it must be the glial cells of the central nervous system that are cancerous.
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A gene that codes for a protein was removed from a eukaryotic cell and inserted into a prokaryotic cell. Although the gene was successfully transcribed and translated, it produced a different protein than it produced in the eukaryotic cell. What is the most likely explanation?
A. Eukaryotic genes often contain introns while prokaryotic genes do not. B. Eukaryotic transcripts have a 5' cap while prokaryotic transcripts do not. C. There are slight differences in the genetic code for prokaryotes and eukaryotes. D. Unlike eukaryotes, which have three different RNA polymerases, prokaryotes have a single RNA polymerase.
Which event of fertilization occurs first?
A. the acrosomal reaction B. the entry of sperm DNA into the egg C. the cortical reaction D. cleavage E. vitelline layer hardens
What is the name of the molecule that binds to CAP to activate transcription of the lac operon?
A) lactose B) galactose C) glucose D) cAMP E) ATP
Why is it entirely possible for a pathogen to appear susceptible in susceptibility testing and resistant in a real-life context?
A) A person's liver may break down the drug before it even begins to benefit the patient. B) Bacterial levels and active drug concentrations vary from one tissue to another in an active infection. C) An active infection is more likely to mutate due to the larger population. D) The ability of the pathogen to live as part of a biofilm and benefit from the protection of other bacteria does not exist in susceptibility tests. E) A real-life infection allows for the possibility of genetic crossover with different bacteria, whereas tests in the lab are focused on studying a single strain of bacteria.