Integral Membrane Proteins Tend to Be Enriched for Regular Secondary

question 65

Multiple Choice

Integral membrane proteins tend to be enriched for regular secondary structures in the transmembrane portions of their structures. Which statement explains this observation?

• A) Regular secondary structures allow for polar amino acids to interact with lipid head groups.
• B) Regular secondary structures allow the polypeptide to interact with the membrane core.
• C) Regular secondary structures are energetically favorable for polypeptides.
• D) Regular secondary structures satisfy hydrogen-bonding potential of the backbone in a hydrophobic environment.

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Definitions:

Endometrium

The inner lining of the uterus, which thickens during the menstrual cycle to prepare for potential pregnancy.

Uterus Lining

The inner layer of the uterus, known as the endometrium, which thickens during the menstrual cycle to prepare for potential implantation of an embryo.

Endothelium

The tissue that lines the cavities of the heart, blood vessels, and lymph vessels.

Diaphragm

A large, dome-shaped muscle located at the base of the lungs, playing a key role in respiration by contracting and expanding the chest cavity.