The first human gene therapy was approved for patients suffering ADA (adenosine deaminase) deficiency. In this therapy, lymphocytes were removed from the patient, the normal ADA gene was put into the cells, and the cells were returned to the bloodstream. How was the normal ADA put into the lymphocytes?
A. Via the polymerase chain reaction.
B. By fusing normal lymphocytes with deficient lymphocytes.
C. Microinjection.
D. Via a plasmid vector.
E. Via a viral vector.
E. Via a viral vector.
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In the frog genus, when certain species attempts to mate with other species, embryo development is halted at various stages including zygotic segmentation, blastula formation, gastrulation, or in the final phases of embryo development
The stage where the developing frog arrests depends on the species involved in the cross. This is an example of A. hybrid breakdown. B. hybrid sterility. C. hybrid inviability D. sexual isolation.
Which is the smallest of all levels of organization?
A. atom. B. cell. C. organ. D. organism. E. population.
Oxytocin can generate feelings of well-being as well as anxiety and stress
Indicate whether the statement is true or false.
Commercial inorganic fertilizers have greatly increased agricultural productivity. What is an advantage of using inorganic rather than organic fertilizers?
A) It is easier for plants to absorb nutrients in an inorganic form. B) Nutrients are released faster from inorganic fertilizers. C) Inorganic nutrients bind more tightly to soil particles. D) Inorganic fertilizers increase the water-holding capacity of the soil.