Normal Hemoglobin Is a Tetramer, Consisting of Two Molecules of β

question 58

Multiple Choice

Normal hemoglobin is a tetramer, consisting of two molecules of β hemoglobin and two molecules of α hemoglobin. In sickle-cell disease, as a result of a single amino acid change, the mutant hemoglobin tetramers associate with each other and assemble into large fibers. Based on this information alone, we can conclude that sickle-cell hemoglobin exhibits

• A) altered primary structure.
• B) altered secondary structure.
• C) altered tertiary structure.
• D) altered quaternary structure.
• E) altered primary structure and altered quaternary structure; the secondary and tertiary structures may or may not be altered.

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Definitions:

Conservation

The protection, preservation, management, or restoration of natural environments and the ecological communities that inhabit them to prevent depletion or degradation.

Land Covered

The extent or area over which land use practices, such as agriculture or urban development, are applied.

Forests

Large areas covered predominantly with trees and undergrowth, playing crucial roles in the Earth's ecosystem and climate regulation.

Worldwide

Pertains to something that is present, considered, or affecting the entire globe or regions across the world.