Some Evidence for Water Has Recently Been Discovered on the Moon

question 192

Multiple Choice

Some evidence for water has recently been discovered on the Moon in the form of

• A) ice in deep craters near the south pole, perpetually shaded from sunlight.
• B) thin, hazy clouds overlaying the dark polar regions, where they are shaded from the Sun's heat.
• C) permafrost embedded in the centers of the large, dark maria, their darker color showing the presence of frost.
• D) fluid water flowing in deep tunnels (some of which have collapsed to form rilles on the lunar surface), where it is protected from solar radiation.

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Definitions:

Hydrophilic

A term describing molecules or substances that have an affinity for water, making them capable of dissolving in or being wetted by water.

Fatty Acid

A lipid that is an organic acid containing a long hydrocarbon chain, with no double bonds (saturated fatty acid), one double bond (monounsaturated fatty acid), or two or more double bonds (polyunsaturated fatty acid); components of triacylglycerols and phospholipids, as well as monoacylglycerols and diacylglycerols.

Ligand

A molecule that binds to a specific site in a receptor or other protein.

Receptor

(1) In cell biology, a molecule on the surface of a