In plants, the _____ is diploid and multicellular.
a) spore
b) gamete
c) zygote
d) sporophyte
Ans: d) sporophyte
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Similarity in evolutionarily unrelated groups due to adaptation to similar environments is called
A. concentric evolution. B. convergent evolution. C. biogeographic evolution. D. Hardy-Weinberg equilibrium. E. both biogeographic and convergent evolution.
The disease multiple sclerosis causes myelin degeneration in vertebrate nervous systems. Knowing
this, what symptoms/effects might you NOT expect in a person with multiple sclerosis?
a. slowed action potential transmission b. tissue numbness c. muscular weakness d. faulty coordination of movements e. memory loss
Species that are the first to colonize an area are termed species.
A. primary B. tertiary C. secondary D. pioneer E. keystone
Which of the following choices best describes the genetic engineering used to prevent rejection of xenotransplants?
1.Transgenic pigs carrying human genes donate organs to patients who also receive bone marrow transplants from the donor pig. 2.Hyperacute rejection of MHC proteins from animal donors is prevented by the use of cloned animal tissues lacking MHC markers. 3.Transgenic pigs carrying human genes donate organs to patients who also receive bone marrow transplants from the donor pig, resulting in chimeric immune systems. 4.A bone marrow transplant from the human patient to the donor pig affects MHC proteins on the pig organs, reducing the severity of xenotransplant rejection.