Which cell would have an inactivated X chromosome?
Answer: female liver cell
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Which of the following statements about substance use during pregnancy is false? a. The antidepressant Paxil can cause fatal heart and lung malformations
b. Use of caffeine during pregnancy has been shown to be safe. c. Drinking alcohol during pregnancy causes FAS, a form of retardation. d. Children of mothers who smoke are more likely to die of postdelivery complications.
Ionic compounds
A. always form salts in solution. B. are hydrophobic. C. are basic in solution. D. are hydrophilic. E. are acidic in solution.
The function of helicase enzymes is to
a. break hydrogen bonds and unwind the two strands of the DNA molecule prior to replication. b. rewind the two DNA molecules after replication. c. remove bases that might have been inserted incorrectly. d. seal new short stretches of nucleotides into one continuous strand. e. fragment old DNA that is no longer of use to the cell.
The scientific method includes all of the following EXCEPT
A) conclusions. B) an observation. C) a hypothesis. D) experimentation. E) a testable theory.