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MCAT Organic Question — Hormone

  • by John
  • Nov 26, 2014
  • MCAT Blog, MCAT Organic, MCAT Question of the Day

Which of the following molecules is a hormone capable of creating physiological and anatomical changes during adolesence which will last a person’s entire life?

 

A)
hormone-a

B)
hormone-b

C)
hormone-c

D)
hormone-d

 

Explanation

 

A: Polypeptide. Note all of the amide bonds. This polypeptide is vasopressin.

B: Classic four-ring steroid structure. This is estradiol.

C: Sugar ring attached to nitrogenous base makes this a nucleotide. This is cytosine monophosphate.

D: Lengthy carbon chains attached to a phosphate group indicates a phospholipid.

 

The question makes reference to a steroid hormone such as testosterone. That’s (B).

 

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