The hydrophilic heads of phospholipids form the
What will be an ideal response?
inner and outer surfaces
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Which of the following statements about differentiated cells is not correct?
A. Transfer of a nucleus from a fully differentiated cell into an unfertilized egg with no nucleus can support the development of an entire organism. B. Cells become differentiated because of changes in nuclear gene expression. C. Cells become differentiated because genes that are not being expressed are deleted. D. Differentiated cells contain a complete genome. E. Mammals have been cloned from completely differentiated cells.
Primary treatment of sewage involves mostly
a. the physical treatment of wastewater through filtration and sedimentation. b. the biological degradation of the organic material. c. the detoxification of heavy metals. d. altering the pH of the wastewater to kill bacteria. e. all of these.
Eventually scientists will find fossil remains that link all groups of organisms in fine detail.
a. true b. false
Which of these gases was absent in the early Earth atmosphere at the time life first appeared?
A) nitrogen B) oxygen C) carbon dioxide D) water vapor