Two MRNAs (MRNA X and MRNA Y) Are Synthesized with the Same

question 64

Multiple Choice

Two mRNAs (mRNA X and mRNA Y) are synthesized with the same exon sequences but poly-A tails of very different lengths. mRNA X is 7,500 bases long. mRNA Y is 6,900 bases long. The mRNA's are added to separate in vitro translation mixtures containing radioactive methionine and the reactions are allowed to proceed for 30 minutes. When the mixtures are analyzed which of the following outcomes will most likely occur?

• A) The mRNA X mixture will contain radioactive proteins but the mRNA Y mixture will not.
• B) The radioactive proteins in the mRNA X mixture will be larger in size than those in the mRNA Y mixture.
• C) The mRNA X mixture will contain more radioactive proteins than the mRNA Y mixture.
• D) The radioactive proteins in the mRNA X mixture will begin with methionine while those in the mRNA Y mixture will not.

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Definitions:

Internal Rate

Commonly denotes the internal rate of return (IRR), the discount rate at which the net present value (NPV) of all cash flows from a specific project is zero.

Cash Operating

The process dealing with the direct cash flows from business operations, emphasizing a company's liquidity in the short term.

Required Rate

The minimum expected return by investors to compensate for the risk of an investment, often used in capital budgeting.

Useful Life

The estimated period over which a fixed asset is expected to be usable by an organization, impacting its depreciation calculations.