The ozone in the atmosphere can be damaged by which of the following?
A) carbon dioxide
B) chlorine
C) methane
D) oxygen
B
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Which of the following has been associated with a form of liver cancer?
A. Human T-cell lymphotropic virus B. Hepatitis A virus C. Human papilloma virus D. Hepatitis B virus
The karyotype of a young patient shows two Barr bodies per cell. What condition might this child have?
A. Turner syndrome B. Triple X syndrome C. Down syndrome D. Klinefelter syndrome E. This child is a normal female.
Alejandro Bonifacio is interested in studying which
of the following as a nutritious alternative to many grain crops? a. rice b. wheat c. spinach d. quinoa e. all of these
Enzymes called ____ form breaks in the DNA molecules to prevent the formation of knots in the DNA helix during
replication. a. topoisomerases b. single-strand binding proteins c. DNA polymerases d. RNA polymerases e. DNA ligases