Which of the Following Statements Is Correct Concerning Ubiquitin

question 3

Multiple Choice

Which of the following statements is correct concerning ubiquitin?

• A) Ubiquitin occurs only in liver cells.
• B) Covalent coupling of ubiquitin to a protein can mark that protein for degradation.
• C) It is involved in transfer of mannose-rich oligosaccharides to proteins.
• D) It is a transcription factor for RNA polymerase II.
• E) it is an snRNP necessary for splicing of mRNA precursors.

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Definitions:

Trabeculae Carneae

Irregular muscular columns that line the interior walls of the ventricles of the heart.

Pectinate Muscles

Internal ridges of myocardium in the atria of the heart.

Visceral Pericardium

The inner layer of the pericardium that closely envelopes the heart.

Epicardium

The outermost layer of the heart wall, also known as visceral pericardium, which provides lubrication and protection to the heart.