You had a cold last month and you caught another one this month from your daughter. 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 significantly different.
d. Your T cells are not working properly.
e. Your antigen-presenting cells do not recognize the second cold virus.
C
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The quick response of the immune system to a second infection is due to the _____, a feature of the immune system as demonstrated by the success of vaccines
a. activation of macrophage cells b. suppression of suppressor cells c. T and B memory cells d. high levels of antigen e. new cytotoxic T cell.
Which of the following is the genetic condition observed in the woman on the left in the above figure?
a. Huntington’s disease b. achondroplasia c. triple recessive condition d. galactosemia e. muscular dystrophies
How did the researchers first know that Marilyn the chimp may be infected with HIV?
a. Because she had HIV RNA in her blood b. Because she had HIV DNA in her tissues c. Because she had been used in HIV research d. Because she had raised antibodies against HIV e. Because she had symptoms of HIV infection, or AIDS
Which statement is correct about all organisms that are eukaryotes?
A) They consist of many cells. B) They have organelles such as a nucleus. C) They consist of cells that are surrounded by a cell wall. D) They can be seen without a microscope.