Purines and Pyrimidines Exist in Two Tautomeric Forms (Lactam and Lactim);nucleosides

question 79

Multiple Choice

Purines and pyrimidines exist in two tautomeric forms (lactam and lactim) ;nucleosides exist in two conformations (syn and anti) .The most common forms found in cells are

• A)lactam and anti.
• B)lactam and syn.
• C)lactim and anti.
• D)lactim and syn.

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Definitions:

Atom

The basic unit of a chemical element, consisting of a nucleus surrounded by electrons.

Neutron

A neutron is a subatomic particle found in the nucleus of an atom, lacking an electric charge and possessing a mass slightly greater than that of a proton.

Electron

A subatomic particle with a negative electric charge, fundamental to chemical bonding and electricity.

Peripheral Nervous System

A part of the nervous system that consists of the nerves and ganglia outside of the brain and spinal cord.