MCAT Biology Question — Protein Synthesis

  • Reviewed By: Liz Flagge
  • Synthesis of intracellular proteins is initiated at which of the following sites?

    1. Free-standing ribosomes
    2. Rough endoplasmic reticulum
    3. Golgi apparatus
    1. I only
    2. II only
    3. I and II
    4. I, II, and III
    Click for Explanation

    I. True. Translation of intracellular proteins is always initiated on free-free standing ribosomes in the cytosol.

    II. False. Proteins that are destined for secretion are translated on ribosomes bound to the rough endoplasmic reticulum, but proteins with an intracellular destination are synthesized on free ribosomes.

    III. False. The Golgi apparatus is responsible for packaging proteins that are to be secreted by the cell.

    Answer: A. See explanations above.

    Want more MCAT practice?

    We’ve got options for every schedule and learning style!

    From the best online MCAT course created by top instructors with 524+ MCAT scores to the most representative full-length practice exams and private tutoring, we can custom tailor your MCAT prep to your goals!

    Not sure which option is right for you? Schedule a free MCAT consultation with an MCAT expert using the form below. No obligation, just expert advice.

    Schedule My Free Consultation

    Create your Free Account to access our MCAT Flashcards SIGN UP NOW

    Leave a Reply

    Your email address will not be published. Required fields are marked *