Is a virus considered alive?
A. Yes, it possesses all of the requirements for life.
B. Yes, it possesses enough of the requirements for life to be considered living.
C. No, it does not possess any of the requirements for life.
D. No, it does not possess all of the requirements for life.
Answer: D
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To treat severe combined immunodeficiency (SCID) by gene therapy, a patient's white blood cells are removed, followed by the delivery of a normal gene into the cells. The altered cells are then returned to the patient's body. This is an example of _____ gene therapy
a. enhancement b. germ-line c. viral d. in vivo e. ex vivo
Donation for research is an important use of
A) extra embryos from ARTs. B) embryos from failed IVFs. C) the extra cells from preimplantation genetic diagnosis. D) savior siblings.
Which term best explains the notable differences in tooth size and shape for the two evolutionarily related species, the aardwolf and the spotted hyena?
a. convergence b. development c. exaptation d. divergence
The specific relationship between a legume and its mutualistic Rhizobium strain probably depends on _____
A) each legume having a chemical dialogue with a fungus B) each Rhizobium strain having a form of nitrogenase that works only in the appropriate legume host C) each legume being found where the soil has only the Rhizobium specific to that legume D) specific recognition between the chemical signals and signal receptors of the Rhizobium strain and legume species