The results of the treatment of 20 boys with SCID-X1 showed that ____.
A. SCID-X1 can be cured through genetic engineering
B. none of those treated were cured of the disease
C. a bone marrow transplant can cure SCID-X1
D. our understanding of the human genome exceeds our ability to modify it
E. the “treatment” caused numerous unforeseen complications.
Answer: A
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A botanist is comparing the metabolic pathways for photosynthesis in cyanobacteria and in redwood trees. What do you expect she will find?
A. These two pathways will demonstrate dramatic differences. B. These pathways will utilize two very chemically different types of chlorophyll. C. These two pathways will actually be quite similar, though subtle differences may exist. D. It is impossible to compare metabolic pathways used in bacteria and eukaryotes.
Dmitri Ivanovski demonstrated that TMV was not spread via bacteria by
A. transmitting sap of infected plants from generation to generation. B. filtering sap from an infected plant through pores smaller than bacteria, and then applying it to a healthy plant. C. spraying sap from an infected plant onto a healthy plant. D. sterilizing sap from an infected plant and then applying it to a healthy plant. E. treating an infected plant with a broad spectrum of antibiotics before extracting sap.
Which of the following attributes is NOT shared by animals and fungi?
A. derived from protists B. heterotrophic C. absorptive nutrition D. secrete digestive enzymes E. have cell walls
Glycolysis and the citric acid cycle comprise two different sets of oxidation reactions. The reaction sequence for glycolysis is linear, whereas the reaction sequence for the citirc acid cycle forms a circle
How does this difference in the arrangement of reactions influence the rate of these processes when an excess amount of a single intermediate is added?