The GM Progenitor Cell Gives Rise to Two Main Classes

question 44

Multiple Choice

The GM progenitor cell gives rise to two main classes of white blood cells in the presence of appropriate colony-stimulating factors. Both of these cell types …

• A) have relatively long half-lives, being capable of living for months if not years.
• B) circulate in the bloodstream for most of their life-span.
• C) are phagocytes.
• D) are unaffected by colony-stimulating factors once terminally differentiated.
• E) All of the above.

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Definitions:

High Tide

The maximum height to which water in the ocean rises relative to the land in response to the gravitational pull of the Moon; also refers to the time when such high levels occur.

Low Tide

The lowest height to which water in the ocean drops relative to the land in response to the gravitational pull of the Moon; also refers to the time when such low levels occur.

Spring Tide

A condition of especially high and low tides caused when the sun, moon, and Earth are aligned, increasing the gravitational pull on the oceans.

Neap Tide

A condition of the sea where the difference between high and low tide is at its least, occurring twice a month.