Biology 2e
Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 37, Problem 6RQ

Why are steroids able to diffuse across the plasma membrane?

  1. Their transport protein moves them through the membrane
  2. They are amphipathic, allowing them to interact with the entire phospholipid
  3. Cells express channels that let hormones flow down their concentration gradient into the cells
  4. They are non-polar molecules.

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When a cell secretes a growth factor that binds to receptors on neighboring cells of different type causing them to proliferate this is an example of endocrine signaling O autocrine signaling O direct intercellular signaling O paracrine signaling O contact-dependent signaling
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Steroid hormones influence cell functions via     nonspecific cellular receptors     secondary messengers     nongenomic signalling     direct gene transcription

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