The Various Classes of Immunoglobulins Are Differentiated on the Basis

question 67

Multiple Choice

The various classes of immunoglobulins are differentiated on the basis of their

• A)asymmetry.
• B)antigen specificity.
• C)light-chain variable segments.
• D)heavy-chain constant segments.
• E)both light-chain variable segments and heavy-chain constant segments.

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Definitions:

Toumai

A nickname for Sahelanthropus tchadensis, one of the oldest known species in the human lineage, discovered in Chad, Africa dating to about 7 million years ago.

Orrorin

An early hominin genus dating back to about 6 million years ago, speculated to be among the first bipedal primates.

Ardipithecus

One of the earliest genera of bipeds that lived in eastern Africa. Ardipithecus is actually divided into two species, the older of which dates to between 5.2 and 5.8 million years ago, and the younger, A. ramidus, dated to around 4.4 million years ago.

Spinal Column

The flexible longitudinal column made of a series of bones called vertebrae, which houses the spinal cord and provides structural support to the body.