As Diagrammed Below, Some Amino Acid Biosynthetic Operons Have Stem

question 10

Multiple Choice

As diagrammed below, some amino acid biosynthetic operons have stem loop structures in the mRNA. These structures play a role in the regulation of the operon by which of the following mechanisms?

• A) The leader sequence shown contains codons for the amino acid. When these are low, the ribosome stalls, allowing a hairpin between the two middle regions to form so that the rest of the message can be translated.
• B) A repressor protein made of that amino acid will bind to the region and prevent translation when large amounts of the amino acid are present.
• C) In the presence of large amounts of the amino acid, the hairpin will wind around the amino acid and prevent further translation.
• D) The uridine-rich region has codons for that amino acid; when present, this region will be a terminator region. The hairpins allow for an RNA to bind that then allows translation to occur.
• E) Catabolite repressor protein can bind and prevent the hairpins from forming, thus allowing translation to occur.

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Definitions:

Compounded Monthly

A term used in finance to describe a process where interest is added to the principal balance of an investment or loan each month, and future interest accumulations are based on the new balance.

Interest

The cost of borrowing money or the return on investment, calculated as a percentage of the principal amount over a period.

Additive Inverse Property

The principle that for any number, there exists another number such that the sum of both is zero.

Real Numbers

All the numbers that can be found on the number line, including both positive and negative numbers, zero, and irrational numbers.