What percentage of parents decide to terminate a Down Syndrome pregnancy?
A. 10 percent D. 70 percent
B. 30 percent E. 90 percent
C. 50 percent
E
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In a normal Drosophila embryo, a gap gene called Krüppel is expressed in the anterior end because it is activated by Hunchback protein, and this region contains a high level of Hunchback
A. true B. false
Which of the following statements concerning the Rh factor is CORRECT?
A) The Rh antigen is on white blood cells. B) Eighty-five percent of humans are Rh positive. C) Preexisting antibodies occur in 85% of the population. D) Rh antibodies are more abundant than the ABO antibodies. E) Eighty-five percent of the human population is Rh negative.
Viroids cause a variety of plant diseases and are composed only of:
a. strands of RNA. b. strands of DNA. c. protein coats. d. peptidoglycan. e. a capsid.
If you were given a new necklace and developed reddening, swelling, and itching of your skin around your neck 24 hours after putting on the necklace, what reason would you give to this phenomenon? What immune cells are involved?
What will be an ideal response?