Mutations Are Important Because They

question 109

Multiple Choice

Mutations are important because they:

• A)provide variation that can result in evolutionary change.
• B)occur in response to environmental demands.
• C)are always beneficial in the individuals affected by them.
• D)usually provide an individual with increased reproductive rates.

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Definitions:

Gray Matter

Regions of the brain and spinal cord consisting primarily of neuronal cell bodies, dendrites, unmyelinated axons, and glial cells, involved in muscle control and sensory perception.

Nuclei

The central and most important parts of an atom, or a cell's structure that contains the genetic material.

Resting Membrane Potential

The electrical charge difference across the cell membrane when the cell is in a non-excited state.

Local Potential

A temporary, localized change in resting potential, usually occurring in neurons, that can lead to an action potential if it reaches threshold.