One of the main obstacles to successful cloning of sheep, apparently overcome by Wilmut et al., was to:
a. find an adult nucleus that was likely to work.
b. synchronize the cell cycles of the donor cell and the egg cell.
c. enucleate the donor cell.
d. have the ability to culture cells in the laboratory.
e. recognize that the nucleus from one sheep cell may contain different genetic information than the nucleus of
another cell from the same animal.
b
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During the ____ phase of the cardiac cycle, blood enters the ventricles. During the ____ phase, blood exits the ventricles
Fill in the blank with the appropriate word.
A species that has population levels so low it faces extinction in all or part of its range is designated as ____
a. riparian b. endemic c. endangered d. threatened e. an indicator
Sources of energy that are renewable and derived from plants are called ________
Fill in the blank(s) with correct word
Which of the following best describes how chromosomes move toward the poles of the spindle during mitosis?
A) The chromosomes are "reeled in" by the contraction of spindle microtubules. B) Motor proteins of the kinetochores move the chromosomes along the spindle microtubules. C) Nonkinetochore spindle fibers serve to push chromosomes in the direction of the poles. D) The chromosomes are "reeled in" by the contraction of spindle microtubules, and motor proteins of the kinetochores move the chromosomes along the spindle microtubules. E) The chromosomes are "reeled in" by the contraction of spindle microtubules, motor proteins of the kinetochores move the chromosomes along the spindle microtubules, and nonkinetochore spindle fibers serve to push chromosomes in the direction of the poles