The ozone hole over Antarctica and the general lowering of ozone levels elsewhere in the stratosphere have been attributed to the ozone-destroying properties of
A) endocrine-disrupting chemicals.
B) nitrogen oxides.
C) sulfur dioxide.
D) chlorofluorocarbons (CFCs).
E) carbon dioxide and methane.
D
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Individuals with Turner syndrome have which of the following sex chromosome complements?
A) XO B) XX C) XYY D) XXY E) XXX
Chromosomes decondense during what phase of mitosis?
a. prophase b. metaphase c. anaphase d. telophase
Which of the following statements is FALSE with regard to DNA replication?
a. DNA synthesis proceeds in the 5’->3’ direction. b. The strand being copied is read in the 5’->3’ direction. c. Both strands replicate at the same time. d. The position of the replication fork is constantly moving. e. Two identical DNA polymerase molecules catalyze replication.
Ian Wilmut successfully cloned Dolly the sheep from a fully differentiated sheep cell. This type of cloning is known as
A. stem cell cloning. B. reproductive cloning. C. therapeutic cloning. D. gene therapy cloning.