Positron emission tomography (PET) of a patient who has consumed the radiotracer fluorodeoxyglucose reveals tumors because
A) any radioisotope accumulates in tumor cells.
B) cancer cells accumulate fluorodeoxyglucose because they consume excessive amounts of glucose through aerobic glycolysis.
C) the fluorodeoxyglucose labels cells killed by the PET treatment.
D) the fluorodeoxyglucose labels only the normal tissue because cancer cells cannot metabolize glucose.
E) the fluorodeoxyglucose associates with the anti-tumor drugs being used for treatment.
Answer: B
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Dr. Singh just returned from a year working in rural Africa for the World Health Organization, and now he has a small clinic in San Francisco. In both locations, he sometimes sees patients with chronic elevated IgE levels. Match the doctor's initial diagnosis for a patient in each location.
1. San Francisco 2. Africa ___ allergies ___ helminth infection
The type of bond illustrated in the accompanying diagram is a(n):
a. ionic bond.
b. polar bond.
c. hydrogen bond.
d. single covalent bond.
e. double covalent bond.
The malarial Plasmodium is difficult for the human immune system to fight off because:
a. as the Plasmodium moves through its series of distinct developmental stages, it produces different cell surface proteins. d. as the Plasmodium moves through its series of distinct developmental stages, it produces different DNA-transcription enzymes. e. it mimics human white blood cells.
Electrophoresis separates proteins on the basis of what factor(s)?
A.) the protein's size B.) the protein's affinity for a ligand molecule C.) the protein's cell of origin D.) the protein's net charge