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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology