A Population of Cells Is Treated with a Polypeptide Hormone

question 4

Multiple Choice

A population of cells is treated with a polypeptide hormone that induces mitosis and the hormone's cell surface receptor is isolated after 15 minutes and subjected to fragmentation and mass spectrometry. Several of the peaks show a slight shift as compared to the same protein from cells not treated with the hormone. What is the most likely explanation of this phenomenon?

• A) Phosphorylation of some amino acid residues.
• B) mRNA editing resulting in a slightly different amino acid sequence.
• C) Alternative exon usage.
• D) Proteolytic processing.

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Definitions:

Collateralized Loan

A loan that is secured by collateral, assets that the lender can seize if the borrower fails to repay the loan.

Prepaid Interest

The amount of interest that is paid in advance of the period to which it relates, often associated with loans or mortgages.

Loan Payable

Loan Payable is the liability account in a company’s balance sheet representing the amount owed to lenders that must be paid back in the future.

Interest Income

Income earned from the lending of funds or through investment in interest-bearing financial instruments.