Which of the following hormones is one that is made by your fat cells and circulates in the blood then sends a signal to the brain to stop eating when you are full?
A. insulin
B. cortisol
C. leptin
D. glucagon
Answer: C. leptin
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Two weeks following a hiking trip in which several ticks were noticed and numerous mosquitoes were biting, a 25-year-old man notices a rash shaped like a red ring on the back of his thigh. He was not concerned because he had no other symptoms. Three months later he noticed significant pain in his elbows and his knees. What is the most likely cause of his illness?
A. Ehrlichiosis B. Rocky Mountain Spotted Fever C. West Nile encephalitis D. Lyme disease
Sequencing of the HIV-1 genome revealed that it is most closely related to ____
a. simian immunodeficiency virus b. feline immunodeficiency virus c. bovine immunodeficiency virus d. hepatitis B e. H1N1
Signals from the parasympathetic nervous system
cause which of the following? a. increase in blood pressure b. increase in pulse rate c. increase in digestive activities d. increase in blood sugar level e. increase in metabolic rate
In a PET scan, a patient is injected with radioactively labeled glucose. Cells take up the radioactive glucose and the scanner detects levels of radioactivity in various parts of the body. This is a measure of the amount of glucose uptake. Cancer cells are often in an environment with low oxygen concentration and they take in high amounts of glucose. Why would a low oxygen environment lead to high glucose uptake?
A. They rely more on glycolysis which is less efficient than oxidative phosphorylation. B. Enzymes function more efficiently in the absence of oxygen. C. They rely more on oxidative phosphorylation which is less efficient than glycolysis. D. Because they require more oxygen to metabolize glucose. E. More energy is produced from glucose in hypoxic conditions.