The Bar Graph Shows the Increasing Life Expectancy of Males

question 6

Multiple Choice

The bar graph shows the increasing life expectancy of males in the United States from 1930 to 2010. Use this graph. How much greater is the life expectancy for American males in 2000 than it was in 1960?

• A) 6 years
• B) 8 years
• C) 7 years
• D) 9 years
• E) 5 years

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Definitions:

Oncogene

A gene that has the potential to cause cancer, usually by being mutated or expressed at high levels.

Tumor Cell

A cell that has undergone genetic changes enabling it to divide uncontrollably and possibly lead to cancer.

Checkpoint Gene

A gene that regulates cell cycle checkpoints to ensure cells do not divide unless certain conditions are met, playing a key role in preventing cancer.

Proto-Oncogene

Gene that, by mutation, can become an oncogene.