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

Biology & Microbiology

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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

Biology & Microbiology

Chromosomes decondense during what phase of mitosis?

a. prophase b. metaphase c. anaphase d. telophase

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology