• Set Yourself Up For Success Webinar

    October 6, 2021 at 2 PM Eastern/11 AM Pacific
    SDN and Osmosis are teaming up to help you get set up for success this school year! We'll be covering study tips, healthy habits, and meeting mentors.

    Register Now!

  • Site Updates Coming Soon

    Site updates are coming next week on Monday, Wednesday, and Friday. Click the button below to learn more!


MCAT AAMC BB Section Bank #27


Full Member
Nov 29, 2019
  1. Pre-Medical
Which statement regarding STRA6-mediated retinol uptake is best supported by the passage?

  1. Retinol uptake activity by STRA6 is limited without the presence of intracellular binding proteins.
  2. The expression of STRA6 is likely to be higher in the liver than in target organs.
  3. Retinol uptake activity by STRA6 is accelerated when retinol is stored as intracellular retinol rather than as retinyl esters.
  4. Binding of holo-RBP to STRA6 is likely to have a Hill coefficient greater than 1.
Does anyone know why 4 is wrong?
Upvote 0


Full Member
Feb 5, 2020
  1. Medical Student
I don’t have access to the passage you’re referring to, but a hill coefficient greater than 1 means the enzyme displays cooperativity (sigmoidal binding curve). Did the passage indicate any cooperativity in the enzyme?
  • Like
Reactions: 1 user
Upvote 0
This thread is more than 1 year old.

Your message may be considered spam for the following reasons:

  1. Your new thread title is very short, and likely is unhelpful.
  2. Your reply is very short and likely does not add anything to the thread.
  3. Your reply is very long and likely does not add anything to the thread.
  4. It is very likely that it does not need any further discussion and thus bumping it serves no purpose.
  5. Your message is mostly quotes or spoilers.
  6. Your reply has occurred very quickly after a previous reply and likely does not add anything to the thread.
  7. This thread is locked.