Which of the following explanations tells you why Joseph became infected with chickenpox in the first place?
A. Joseph should not have been infected because he had passive natural immunity from breastfeeding as a baby.
B. His mother should have had gamma globulin administered so he would have passive artificial immunity.
C. There is no way Joseph could have been protected from the infection, since he did not receive active artificial immunity through the form of a vaccine.
D. Joseph probably has a primary immunodeficiency disease, otherwise there is no reason humans should be infected with chickenpox.
C. There is no way Joseph could have been protected from the infection, since he did not receive active artificial immunity through the form of a vaccine.
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A mutation allows only A gene activity in a developing flower. Which flower part(s) will develop in this plant?
A) sepals B) petals C) stamens D) carpels E) both sepals and petals
The "pin" structure of a helicase:
A. serves as a spool for the DNA. B. holds the helicase dimers in the correct position. C. allows rewinding of the DNA after transcription. D. separates the complementary strands of DNA. E. prevents a translocation mechanism.
The process of post-transcriptional gene silencing triggered by micro-RNA molecules that stop translation is called ____
a. RNA interference b. micro-interference c. translational interference d. transcriptional disruption e. disruptive genetic silencing
Which organism’s reproductive pattern exhibits semelparity?
a. grizzly bear b. oak tree c. red deer d. salmon e. maple tree