Answer the following questions true (T) or false (F)
1. If an Rh-positive woman marries an Rh-negative man, their children are at risk for hemolytic disease of the newborn.
2. Infection with certain viruses may lead to the development of type I diabetes.
3. Depletion of the helper T cell population by HIV results in the development of AIDS.
1. FALSE
2. TRUE
3. TRUE
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You had a cold last month and you caught another one this month from your brother. Why could this
happen?
a. Memory cells were not formed as a response to the first cold. b. The antibodies formed as a response to the first cold were degraded. c. The two cold viruses are different. d. Your macrophages are not working properly. e. Your antigen-presenting cells do not recognize the second cold virus.
Charlotte liked to have a suntan all of the time, so she never wore sunscreen at the beach or in the tanning salon. During a visit to her doctor, she was told that she has the most common form of skin cancer
She will be all right, but she should avoid prolonged exposure to UV radiation in the future. Which skin cancer does she have? A) melanoma B) squamous cell carcinoma C) sebaceous carcinoma D) basal cell carcinoma
Which concentration of ethanol is the most effective bactericide?
A) 100 percent B) 70 percent C) 50 percent D) 40 percent E) 30 percent
In ________ selection, individuals intermediate in a phenotypic distribution have greater reproductive success.
A. balancing B. negative frequency-dependent C. directional D. stabilizing E. disruptive