In a form of early-onset Alzheimer disease caused by a mutation on chromosome 14, A is changed to T at the first position of codon 146, which substitutes leucine for methionine. This mutation is a ________ and is ________.
A) transversion; nonsense
B) transversion; missense
C) transition; missense
D) transition; nonsense
B) transversion; missense
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The activation of the SOS system in a bacterium infected with a prophage results in
A. destruction of the viral genes. B. complete lysis of the bacterial culture. C. mutation of the DNA. D. destruction of the viral repressor through host protease activity. E. complete lysis of the bacterial culture AND destruction of the viral repressor through host protease activity.
The ____ horizon extends to the underlying bedrock, and consists of mineral particles and rock fragments but
generally no organic material?
a. A b. B
c. C d. D e. O
Based on the position of the continents in Earth’s history, you would expect the organisms of Australia to be more closely related to those of:
1.Europe
2.Asia
3.North America
4.South America
An ecologically friendly city that has housing, work, and schools located close to each other would decrease the requirement for
a. public transportation b. pedestrian traffic c. bikes d. cars e. electricity