What is the danger of Ug99 to global food production? What will be an ideal response?
Ug99 is a strain of Puccinia graminis that is able to cause wheat stem rust in strains of wheat
previously thought to be resistant. Wheat provides a large fraction of the world’s food, and thus any
wheat pathogen is dangerous. What makes P. graminis particularly dangerous is that its spores can be
distributed on the wind over tremendous distances.
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If a patient lacks B cells, the resulting disease is
A. SCID. B. AIDS. C. Di George's syndrome. D. agammaglobulinemia.
Why don't ants that protect the Acacia tree scare off bees trying to pollinate the tree's flowers?
A. They can't climb to the tops of the tree. B. The bees are too big. C. The bees fly in and out quickly. D. The open flowers contain a chemical that is an ant deterrent. E. Parasitoid wasps protect the bees from attack.
How are DNA and RNA similar?
a. They are both comprised of long chains of nucleotides. b. They are both comprised of deoxyribonucleic acid. c. They are both comprised of long chains of glucose. d. None of the above.
What is the primary body part affected by tuberculosis?
A) the liver B) the muscles C) the immune system D) the lungs