You are a physician, and you suspect your patient has a viral infection that has never been seen in humans. The infection is localized in the cells along the lining of the small intestine
The cells in this area are regularly sloughed off and replaced with new cells; that is, these cells are constantly dividing. When you isolate this new virus and incubate it in culture, you discover that it does not replicate well in cultures that have slowly dividing cells, but it does much more damage in cultures that have actively dividing cells. What do these findings suggest about this new virus?
A) It is a double-stranded RNA virus.
B) It is a negative-sense, single-stranded RNA virus.
C) It is a double-stranded DNA virus.
D) It is a single-stranded DNA virus.
Answer: C
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If the energy of the sun no longer reached Earth, the primary productivity of which of the following ecosystems would be least affected?
A. deep sea hydrothermal vent B. temperate rain forest C. desert D. taiga E. coral reef
You are a doctor who specializes in genetic diseases. A married couple comes to see you for genetic counseling. The woman has PKU, the symptoms of which she manages by diet
The man and woman are first cousins and would like to know the probability that any of their children will have the disease. What would you tell them?
Ionotropic receptors act by activating G proteins in target cells.
Answer the following statement true (T) or false (F)
What happens first following a neuronal stimulation?
A. Sodium ions enter the cell. B. Sodium ions leave the cell. C. Potassium ions enter the cell. D. Potassium ions leave the cell. E. Potassium ions are involved in positive feedback.