Evidence that all differentiated cells contain the organism's complete genome is provided by ____
a. comparing frog and sea urchin development
b. observing that some cells remain totipotent
c. observing that totipotent cells give rise to multipotent cells
d. observing that multipotent cells give rise to pluripotent cells
e. the successful cloning of a sheep, Dolly
ANSWER: e
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Similar patterns of character acquisition leading to complex multicellularity are seen in plants and animals
A. true B. false
Bacteroids are terminally differentiated-they can neither divide nor revert back to the nondifferentiated state.
Answer the following statement true (T) or false (F)
What is one problem associated with using retroviruses as human gene therapy vectors?
A) Their random integration into the host chromosome may result in detrimental mutations. B) They need to integrate through an RNA intermediate. C) The level of proteins produced from them is usually very low. D) The level of proteins produced from them is usually very high.
The nervous system develops enough to permit reflex actions during which period of development?
A. fetal, months 3-4 B. embryonic, weeks 2-3 C. embryonic, weeks 4-5 D. embryonic, weeks 6-8 E. pre-embryonic