Current Estimates Place the Age of the Universe at About

question 16

Multiple Choice

Current estimates place the age of the universe at about

• A)10 billion years.
• B)10 million years.
• C)14 billion years.
• D)4 1/2 billion years.

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Definitions:

Specificity

The ability of a test or biological mechanism to accurately identify a particular substance or pathogen without cross-reacting with other substances.

Synapses

The junctions between neurons through which nerve impulses pass by diffusion of neurotransmitters across a gap.

Hyperpolarization

A change in a cell's membrane potential that makes it more negative, moving further from zero.

Inhibitory Postsynaptic Potential

Hyperpolarization in the postsynaptic membrane, which causes the membrane potential to move away from threshold.