When cloning Dolly, in order to encourage the plasma membranes of the two cells to become leaky so that the contents of the mammary cell passed into the egg cell, researchers applied
A. several methyl groups.
B. an electrical shock.
C. adeno-associated viruses.
D. DOPA.
Answer: B
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Chemotherapeutic agents that are natural products of microorganisms are most specifically referred to as ________.
A. synthetic drugs B. antimicrobial agents C. antibiotics D. semisynthetic drugs
____ behavior corresponds to an animal's "nature"; learned behavior corresponds to its " ____ ."
Fill in the blank with the appropriate word.
What would a scientist see when looking through a microscope at a piece of shoulder muscle?
A. striations with unbranched fibers B. striations with branched fibers C. no striations and unbranched fibers D. no striations and branched fibers E. The scientist would see none of the above features in shoulder muscle.
The age structure data for Nigeria shows that the country has many more individuals under the age of 15 than over the age of 40. What does this imply about the future population of Nigeria?
A) the population will probably remain stable B) the population will probably decrease C) the population will probably grow rapidly D) the population will probably increase, but slowly E) the number of older people will probably increase rapidly