The 5' end of a DNA molecule can be chemically distinguished from the 3' end because there is a(n) ________ group at the 5' end and a(n) ________ group at the 3' end
A) amine; carboxyl
B) phosphate; sulfate
C) hydroxyl; hydrogen
D) phosphate; hydroxyl
E) amine; hydroxyl
Answer: D
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A new virus has recently been identified that has been linked to certain birth defects. A pregnant woman is infected with this virus in the fifth month of her pregnancy. However, at birth, the infant shows no signs of the characteristic birth defects. What is the most likely explanation?
A) The virus actually doesn't cause birth defects. B) The woman was likely infected after the virus' critical period. C) The woman was actually infected by a different virus. D) The woman was likely infected during the virus' critical period.
What term describes the unwinding and changes in the shape of a protein?
a. Denature b. Metabolism c. Condensation d. Hydrolysis e. Breakdown
Due to global warming what occurred in fish in the North and Celtic seas?
A) Species richness increased. B) Species richness declined. C) Fewer deep-water species were present. D) Fewer shallow-water species were present.
Which of the following viruses is a DNA virus that infects liver cells?
A. hepadnaviruses B. herpesviruses C. polyomaviruses D. poxviruses E. adenoviruses