The Deposits of Chalky Fossils That Built the White Cliffs

question 45

Multiple Choice

The deposits of chalky fossils that built the White Cliffs of Dover were formed by

• A) Amoebozoans.
• B) Rhizarians.
• C) Excavates.
• D) Opisthokonts.
• E) Chromalveolates.

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Definitions:

Asymmetric Carbons

Refers to carbon atoms bonded to four different groups, making them centers of chirality.

Asymmetric Carbons

Carbon atoms that are attached to four different groups, making them stereocenters leading to chiral molecules.

Cis-1,2-dimethylcyclopentane

A cyclopentane molecule with two methyl groups attached to adjacent carbon atoms in the same plane.

Trans-1,3-dimethylcyclopentane

A cyclopentane molecule with methyl groups at the 1 and 3 positions, oriented across from each other.