Eukaryotic Cells Are Thought to Have

question 19

Multiple Choice

Eukaryotic cells are thought to have

• A)appeared about 2.1 billion years ago.
• B)first appeared as parts of multicellular organisms.
• C)evolved before prokaryotic cells.
• D)developed when mitochondria grew much larger in size that they had been previously.
• E)first appeared with tough cell walls.

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Definitions:

Social Readjustment Rating Scale

A scale designed to measure the amount of stress in a person's life resulting from major life changes, as part of the stress and coping research.

Optimists

People who tend to maintain a positive outlook and approach life's challenges with confidence and hope.

Pessimists

Individuals who tend to see the worst aspect of things or believe that the worst will happen; a tendency to expect negative outcomes.

Stress

A state of mental or emotional strain or tension resulting from adverse or demanding circumstances.