In Nature, What Is the Order of Events in Processing

question 47

Multiple Choice

In nature, what is the order of events in processing the product of the gene for insulin?

• A)cleavage of 35 amino acids from the middle of the polypeptide to make two chains that are then joined by disulfide bonds
• B)cleavage of 24 amino acids from the N terminus to form proinsulin that is subsequently cleaved to make A and B chains
• C)removal of 5′ leader sequence from the mRNA, and splicing out of a large central intron to produce the mRNA that codes for the final form of polypeptide
• D)removal of large mRNA sequences by RNA editing, followed by splicing of the products of the two insulin genes
• E)transcription of the two insulin genes A and B, translation, and posttranslational joining of the two polypeptides

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Definitions:

Physical Barrier

Any natural or artificial structure that blocks or limits movement, spread, or access of organisms or materials.

Polyploidy

The condition of having more than two complete sets of chromosomes in an organism, common in plants and some animal species.

Sexual Dimorphism

The noticeable difference in appearance between males and females of the same species, beyond just the reproductive organs.

Male Traits

Characteristics, either physiological or behavioral, that are commonly seen in males of a species, often influenced by genetic and hormonal factors.