Provide examples where tumor cells transferred between a donor and a recipient are either (A) rejected and do not cause cancer, or (B) not rejected and cause cancer
What will be an ideal response?
A. If primary tumor cells are donated between MHC-disparate mice, the cytotoxic T cells of the recipient recognize differences in MHC class I and kill the tumor cells.
B. (i) The marsupial known as the Tasmanian devil can pass tumor cells between individuals when fighting and biting each other's faces. Because of limited MHC diversity in the species, there is a lack of allograft rejection, and the tumor cells establish themselves at the site of facial injury. (ii) In humans, residual tumor cells in an HLA-matched transplanted organ will not be rejected because the recipient is immunosuppressed and unable to mount an antitumor immune response.
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Identify a true statement about smoking.
A. Smoking even a single cigarette causes an irreversible damage to the respiratory system. B. Individuals who smoke are more likely to experience a heart attack when they begin exercising. C. It would take a chronic smoker more than 75 years to clear out the lungs fully upon quitting. D. Pregnant women should smoke no more than two cigarettes a day to ensure a healthy pregnancy E. Cigarette smoke severely restricts the blood's oxygen-carrying capacity.
Researchers have found an actual growth in gray matter in the brain's ____ as individuals build self-control.
A. basal ganglia B. prefrontal cortex C. corpus striatum D. stem E. cerebellum
Blephar/o means:
A)ear? B) eye C) eyelid D) nose
The rate of illicit drug use is much higher among people who are unemployed
Indicate whether the statement is true or false.